If you are choosing between successfully and succesfully, there is only one standard spelling to use in US English.
Successfully is correct. Succesfully is a misspelling.
The correct word is an adverb. It describes an action that achieves the intended or desired result. You can use it in everyday writing, professional communication, schoolwork, and formal writing.
The confusion mainly comes from the repeated letters in successfully. The word contains several doubled letters, which makes it easy to leave one out when typing quickly.
Quick Answer
Successfully is the correct spelling.
Succesfully is incorrect and should not be used as an alternative spelling. It has no separate meaning or special informal use.
Examples:
- She successfully completed the course.
- The team successfully solved the problem.
- He successfully repaired the damaged equipment.
The easiest way to remember the spelling is to connect it to the word family:
success → successful → successfully
Keep the spelling of success when forming the longer words.
Why People Confuse Them
The spelling of successfully is visually complicated. It contains repeated consonants, including cc, ss, and ll.
When people write quickly, one repeated letter can easily disappear. Pronunciation also does not make every written letter obvious, so hearing the word is not enough to reconstruct its spelling perfectly.
The incorrect form succesfully looks believable because it is only one letter away from the correct form. However, that missing s makes it a spelling error rather than a different word.
Remember the base:
success
Then build the word family:
success → successful → successfully
That pattern is more reliable than trying to remember the entire adverb letter by letter.
Key Differences At A Glance
| Feature | Successfully | Succesfully |
|---|---|---|
| Standard spelling | Yes | No |
| Meaning | Achieving an intended result | None as a standard word |
| Part of speech | Adverb | Misspelling |
| US-English use | Standard | Incorrect |
| Formal writing | Appropriate | Should be corrected |
There is no meaning-based distinction between the two forms. The issue is simply that successfully is the standard written form.
Meaning and Usage Difference
Successfully means “in a way that achieves the intended or desired result.”
It normally modifies an action:
- The technician successfully installed the new system.
- The students successfully completed the assignment.
- The company successfully launched its new service.
The word tells the reader about the outcome of the action.
For example, “The technician installed the system” tells us what happened. “The technician successfully installed the system” additionally tells us that the installation achieved its intended result.
Succesfully does not have a different meaning. It is simply an incorrect spelling of successfully.
Tone, Context, and Formality
Successfully works across a wide range of contexts. It does not belong only to formal writing.
You can use it in:
- Everyday messages
- School assignments
- Workplace communication
- Academic writing
- Instructions
- Reports
For example:
We successfully finished the project before Friday.
That sentence sounds natural in both ordinary and professional communication.
The problem with succesfully is not tone. It is spelling. Changing the context does not make the incorrect form acceptable.
Which One Should You Use?
Use successfully whenever you need this adverb.
Choose it when you want to show that an action reached its intended result:
- successfully completed
- successfully passed
- successfully repaired
- successfully launched
- successfully solved
- successfully delivered
Do not switch to succesfully in casual writing, and do not treat it as a shortened version.
A useful check is to look for the base word success. If you remember that spelling, the correct longer form becomes much easier to recognize.
When One Choice Sounds Wrong
Successfully sounds and reads natural because it is the established standard form.
Succesfully may still be understandable to a reader, but it looks like a typo. It can distract from otherwise clear writing, especially in a resume, application, report, assignment, or business message.
For example:
- Incorrect: The team succesfully completed the project.
- Correct: The team successfully completed the project.
The sentence does not need a different word. It only needs the correct spelling.
Common Mistakes (and Quick Fixes)
The most common mistake is dropping one of the repeated letters.
Incorrect: succesfully
Correct: successfully
Other errors can also occur when writers type the word quickly. The safest approach is to remember the word family:
success → successful → successfully
Another useful visual check is to look for the sequence:
success + ful + ly
The suffix -ful is spelled with one l, while adding -ly to successful produces the ll sequence near the end.
Do not try to create a new spelling based on pronunciation. The established written form is successfully.
Everyday Examples
Here are natural examples in modern US English:
- Maya successfully completed her driver’s education course.
- The technician successfully restored the customer’s files.
- We successfully moved the meeting to Friday.
- The restaurant successfully reopened after renovations.
- Jordan successfully applied for the position.
- The software successfully connected to the network.
- The team successfully finished the presentation before the deadline.
- She successfully negotiated a better delivery date.
In every example, successfully describes the action and indicates that the intended result was achieved.
Dictionary-Style Word Details
Verb
Successfully: Not a verb. It is an adverb.
Succesfully: Not a standard verb or standard dictionary word. It is a misspelling of successfully.
Noun
Successfully: Not a noun. The noun in the same word family is success.
Succesfully: Not a standard noun.
Synonyms
Successfully: Closest plain alternatives include well, effectively, favorably, and victoriously, depending on the sentence. These are not interchangeable in every context.
A direct antonym is unsuccessfully.
Succesfully: No synonyms or antonyms apply because it is not a standard word with its own meaning.
Example Sentences
Successfully:
- The team successfully completed the inspection.
- She successfully resolved the billing issue.
Succesfully:
- Incorrect: The team succesfully completed the inspection.
- Correct: The team successfully completed the inspection.
Word History
Successfully belongs to the word family built around success. Standard dictionary references identify successful as derived from success plus -ful, with successfully serving as the adverbial form.
Succesfully has no separate standard word history because it is a misspelling rather than an established word.
Phrases Containing
Successfully: Common combinations include successfully complete, successfully achieve, successfully complete a task, successfully solve, successfully launch, and successfully operate.
Succesfully: No standard phrases use this spelling. When it appears inside a phrase, it should normally be corrected to successfully.
FAQs
Is “successfully” the correct spelling?
Yes, successfully is the correct standard spelling. It is the adverb used when an action achieves its intended result. Succesfully is a misspelling, so it should be corrected in schoolwork, professional writing, messages, and other standard written English.
Is “succesfully” ever acceptable?
No. Succesfully is not an accepted alternative spelling in standard US English. It does not have a separate meaning, pronunciation, or informal status. If you see it in a document, treat it as a spelling error and replace it with successfully.
What does “successfully” mean?
Successfully means in a way that achieves the intended or desired result. It normally describes an action, such as completing a task, solving a problem, launching a project, or reaching a goal. The focus is on the successful outcome of that action.
Why is “successfully” so easy to misspell?
The spelling contains several repeated letters, including cc, ss, and ll. When people type quickly or rely only on pronunciation, one repeated letter can disappear. Remembering the sequence success → successful → successfully makes the spelling easier to check.
Can “successfully” be used in formal writing?
Yes. Successfully works in formal, professional, academic, and everyday US English. Its register does not make it informal or overly casual. Choose it when you need an adverb showing that an action achieved the intended result, regardless of the setting.
Can “successfully” and “succesfully” be used interchangeably?
No. They are not interchangeable because only successfully is the standard spelling. The two forms may look similar, but succesfully is simply an error. Replacing it with successfully fixes the spelling without changing the sentence’s intended meaning.
Conclusion
Successfully is the correct form in standard US English. Succesfully is a misspelling, not an alternative word or informal variant.
The correct spelling is easier to remember through the word family:
success → successful → successfully
Use successfully when you need an adverb showing that an action achieved its intended result. Whether you are writing an email, assignment, report, or everyday message, this is the form to choose.
