Quick Answer
Many of us struggle with spelling common words like "definitely" and "separate". It's a common pitfall because the way these words sound doesn't always match their correct spelling. Their origins also add to the confusion, making them surprisingly tricky to get right even though we use them all the time.
In a hurry? TL;DR
- 1Consistently misspell 'definitely' as 'definately' due to phonetic confusion with similar suffixes.
- 2Avoid misspelling 'separate' as 'seperate' by remembering the 'a' in the middle, despite pronunciation.
- 3Remember 'necessary' has one 'c' and two 's's to avoid common consonant doubling errors.
- 4Correctly spell 'restaurant' with 'au' (like in French origin) instead of transposing vowels.
- 5Be aware that modern spellcheck can reduce reinforcement, making these common words harder to remember.
- 6Proofread carefully for these frequent misspellings, as they can negatively impact professional perception.
Why It Matters
It's surprising that even everyday words like "definitely" and "separate" are so consistently misspelled due to a mix of phonetic and historical reasons.
The words definitely, separate, necessary, and restaurant represent a specific category of linguistic traps that consistently defeat the average American writer. Despite their ubiquity in daily correspondence, these four terms remain the most frequently misspelled words in the United States.
Key Misspelling Data
The following terms represent the highest frequency of errors in digital and academic writing across the US.
- Word: Definitely
- Common Error: Definately
- Primary Cause: Phonetic confusion (the schwa sound)
- Word: Separate
- Common Error: Seperate
- Primary Cause: Visual similarity to standard suffixes
- Word: Necessary
- Common Error: Neccessary / Necesary
- Primary Cause: Consonant doubling confusion
- Word: Restaurant
- Common Error: Resturant / Restaraunt
- Primary Cause: Transposed vowels from French origin
The Anatomy of a Slip-up
These words are not inherently complex, yet they share a specific DNA that triggers human error. According to data analysis from Google Trends and studies conducted by the American Literacy Council, the difficulty often lies in the disconnect between American phonetics and etymological roots.
Take the word separate. The error almost always occurs in the middle vowel. Because Americans tend to pronounce the word as sep-rit, the internal A is swallowed. This leads the brain to default to an E, which feels more natural in the flow of English suffix patterns.
In contrast to purely phonetic languages like Spanish or Finnish, English is a linguistic scavenger. It retains the spelling of its ancestors while evolving its sounds. Restaurant, borrowed from the French restaurer, keeps its AU combination even though many Americans pronounce it with a flat A or omit the second syllable entirely.
The Cognitive Trap of Definitely
Definitely is perhaps the most notorious offender. According to researchers at Oxford University Press, it is consistently one of the most misspelled words in the English language globally, not just in the US.
The error usually manifests as definately. This happens because the suffix -ately is common in English adjectives like fortunately or accurately. The mind searches for a familiar pattern and grafts it onto the root word definite, ignoring the fact that the word is derived from the Latin finis, meaning boundary or limit.
Why It Matters
The stakes for these errors are higher than they appear. A study published in the Journal of Business Communication found that recruiters and hiring managers perceive candidates as less conscientious when resumes contain these specific common misspellings.
Because we use these words so often, failing to master them suggests a lack of attention to detail rather than a lack of vocabulary. It is the linguistic equivalent of a typo in your own phone number.
Practical Applications for Accuracy
To stop relying on the red squiggle of autocorrect, many writers use mnemonics that bypass phonetic intuition:
- Separate: Remember there is a rat in separate.
- Necessary: A shirt has one Collar and two Sleeves (one C, two S’s).
- Definitely: It is finite; therefore, it is definitely.
- Restaurant: Focus on the tau at the end, as in the Greek letter, or think of the rant you might have over bad service.
Interesting Connections
The etymology of these words reveals their hidden structures. Restaurant originally referred to a restorative bouillon served in 18th-century France to people too weak to eat a full meal. Meanwhile, the word necessary is tied to the Latin necesse, meaning unavoidable.
In contrast to other languages, English allows for these errors because it has an unusually high number of homophones and silent letters. Whereas a German speaker can almost always spell a word correctly if they can hear it, an American must rely on visual memory.
Why is separate so hard to spell?
The middle vowel is a schwa sound, meaning it is unstressed and unclear. Most people hear an E, but the word comes from the Latin separatus, which uses an A.
Is it definately or definitely?
It is always definitely. If you find yourself wanting to use an A, remember the root word is definite.
Does autocorrect make us worse at spelling?
Yes. Studies suggest that digital dependency reduces our ability to recall the orthographic structure of words because we no longer have to manually correct our mistakes.
Key Takeaways
- Phonetics are misleading: Spelling these words by sound is the most common cause of error.
- Pattern recognition: We often apply common suffixes like -ately to words where they don't belong.
- Social cost: Common misspellings in professional settings significantly impact perceived intelligence and reliability.
- Mnemonics work: Using visual cues like the rat in separate is more effective than trying to sound the word out.



