Last week, a student sent an email to her teacher. She wrote, “I mistakingly attached the wrong file.” The teacher replied politely and corrected the word to mistakenly.
This small spelling mistake is extremely common among English learners and writers. Many people search online to understand whether mistakingly or mistakenly is correct.
Both words look logical, but only one is accepted in standard English.
In this guide, you will learn the difference between mistakingly vs mistakenly, their meanings, examples, common mistakes, and grammar rules so you can write with confidence.
Quick Answer
The correct spelling is mistakenly.
Mistakingly is usually considered a misspelling or non-standard variation.
| Word | Status | Meaning | Example |
|---|---|---|---|
| Mistakenly | Correct | By mistake or in error | I mistakenly deleted the document. |
| Mistakingly | Non-standard | Rarely accepted | She mistakingly called the wrong number. |
Most dictionaries recommend using mistakenly in formal writing.
Authoritative references like Oxford English Dictionary, Merriam-Webster, and Cambridge Dictionary list mistakenly as the correct standard form.
The Meaning of Mistakenly
The adverb mistakenly means doing something by accident or error.
It describes an action performed because of misunderstanding or incorrect judgment.
Simple examples
- I mistakenly sent the email to the wrong person.
- The customer was mistakenly charged twice.
- The teacher mistakenly marked the answer wrong.
The word is commonly used in professional communication, news articles, and academic writing.
Why Do People Write “Mistakingly”?
Many learners assume mistakingly should exist because the verb mistake ends with “-ing.”
However, English word formation does not follow that pattern here.
The correct form comes from the adjective mistaken, not from mistaking.
mistaken → mistakenly
This grammatical pattern appears in other English words:
| Adjective | Adverb |
|---|---|
| sudden | suddenly |
| quick | quickly |
| mistaken | mistakenly |
Because of pronunciation, some people type mistakingly, especially in informal writing.
The Origin of the Word “Mistakenly”
The root word mistake appeared in English around the 16th century.
It comes from Old Norse influences in Middle English vocabulary.
Over time, English speakers developed the adjective mistaken.
The adverb mistakenly formed by adding the suffix -ly.
Today, dictionaries and grammar guides consistently recommend mistakenly as the correct spelling.
Mistakenly in Everyday Communication
The word mistakenly appears frequently in modern communication.
Professional emails
- I mistakenly attached the wrong document earlier.
- The report was mistakenly sent before review.
News reports
Journalists often use the word when describing errors.
Example:
“The suspect was mistakenly identified by witnesses.”
Academic writing
Students and researchers use it to explain incorrect assumptions.
Example:
“The data was mistakenly interpreted during the initial analysis.”
Mistakenly in Technology and Digital Life
The word appears often in technology-related contexts.
Examples include:
- mistakenly deleted files
- mistakenly sent messages
- mistakenly uploaded documents
- mistakenly removed photos
Modern writing tools such as Grammarly or editing tools developed by Microsoft can help identify spelling mistakes like mistakingly.
These tools automatically suggest mistakenly instead.
Common Mistakes With Mistakenly
Many writers make similar mistakes when using the word.
1. Writing “mistakingly”
This is the most common error.
Correct form: mistakenly
2. Using the wrong verb tense
Incorrect: I mistakenly forgot my phone.
Better: I accidentally forgot my phone.
3. Overusing the word
Sometimes simpler words such as accidentally or by mistake work better.
Mistakenly vs Accidentally
The words mistakenly and accidentally are similar but slightly different.
| Word | Meaning | Example |
|---|---|---|
| Mistakenly | Because of misunderstanding | I mistakenly believed the meeting was today. |
| Accidentally | Without intention | I accidentally broke the glass. |
Understanding this difference improves writing clarity.
Example Sentences Using Mistakenly
Here are some common real-life examples.
- She mistakenly sent the confidential email to the wrong department.
- The system mistakenly deleted several important files.
- He mistakenly thought the store was closed.
- The passenger was mistakenly placed on the wrong flight list.
- I mistakenly saved the file in the wrong folder.
These examples show how frequently the word appears in professional and daily communication.
Why Correct Spelling Matters
Correct spelling improves clarity and credibility.
When readers see misspellings such as mistakingly, they may question the writer’s professionalism.
Using the correct word also improves search visibility, readability, and grammar accuracy.
Writers, bloggers, and students should always verify spelling with reliable dictionaries or editing tools.
FAQs
Is “mistakingly” a real word?
It appears occasionally in informal writing, but most dictionaries consider it incorrect.
What is the correct spelling?
The correct spelling is mistakenly.
Why do people confuse these words?
Because the verb mistake sounds similar to mistaking, people assume the adverb should be mistakingly.
Can I use “mistakenly” in formal writing?
Yes. It is widely accepted in academic, professional, and journalistic writing.
What is a synonym for mistakenly?
Common synonyms include accidentally, unintentionally, and erroneously.
How can I avoid spelling mistakes?
Use proofreading tools and trusted dictionaries.
Final Thoughts
Understanding the difference between mistakingly or mistakenly is simple once you know the rule. The correct word is mistakenly, an adverb that describes doing something by error or misunderstanding.
Although mistakingly appears occasionally online, it is considered non-standard and should be avoided in formal writing.
Writers, students, and professionals should rely on trusted references and proofreading tools to maintain accuracy.
By choosing the correct spelling and using it naturally in sentences, you can communicate clearly and confidently in both everyday and professional English.
Bryan A. Garner is a renowned grammar expert, lexicographer, and author at Grammiffy, where he makes English rules easy to understand for learners and writers of all levels.
With a focus on clarity, proper usage, and effective communication, Bryan helps readers master grammar, style, and everyday writing with confidence.
