Wont vs won't is one of those confusions that catches even careful writers off guard. The two words differ by a single apostrophe, yet they carry completely unrelated meanings. Won't is a contraction of "will not." Wont is an adjective or noun meaning habitual behaviour or custom. Swap them and your sentence says something absurd.
What won't means
Won't is a contraction. It shortens "will not" into a single spoken unit. It's the form you reach for when expressing a refusal or a prediction that something will not happen. "She won't answer the phone." "The file won't open." In both cases, you can substitute "will not" and the sentence holds. That substitution test is the fastest way to check your work.
The apostrophe in won't marks the omission of letters, just as it does in don't (do not) or can't (cannot). One oddity: the vowel shifts from "will" to "won," which is why the contraction looks strange compared to others. The form has been in English since the 17th century and is now universal in standard written English.
What wont means
Wont (no apostrophe) is a formal or literary word meaning a habitual custom or practice. It functions as both an adjective and a noun. As an adjective it means "accustomed" or "in the habit of." As a noun it means the habit itself. Both uses are old-fashioned, more common in written prose than in everyday speech.
As an adjective: "He was wont to rise before dawn." That means he habitually rose before dawn. As a noun: "As was her wont, she arrived exactly on time." That means it was her habit or custom to arrive exactly on time. You won't encounter wont in casual conversation, but it turns up in literary writing, journalism, and formal essays.
There's a third related form worth knowing: wonted, the adjective meaning "habitual" or "usual." "He returned to his wonted routine." It follows the same formal register as wont and belongs in the same company of slightly archaic but precise vocabulary.
Why the confusion happens
The mix-up between wont and won't is almost entirely visual. When typed quickly, it's easy to drop the apostrophe from won't and land on wont. In the other direction, a writer reaching for the formal adjective might instinctively add an apostrophe by analogy with other contractions. Autocorrect doesn't always help, since both are real words and spell-checkers typically ignore the distinction.
The problem is compounded by pronunciation. In many accents, wont (the adjective) and want blur together, while won't sounds clearly different. Writers who learned the word aurally may not have a firm spelling for the adjective anchored in memory. A similar sound-to-spelling drift drives mix-ups like the one between alternate and alternative, where the closeness in sound disguises the difference in meaning.
Quick rule for choosing between them
Ask one question: can you replace the word with "will not"? If yes, you want won't with an apostrophe. If no, and you're describing a habit or custom, you want wont without an apostrophe.
- "She won't agree." (= "She will not agree." The apostrophe belongs here.)
- "As was his wont, he ordered the same meal." (= habitual behaviour. No apostrophe.)
If you're not describing a habit, and "will not" doesn't fit either, you've probably reached for the wrong word altogether. Check whether you meant want (desire) instead, since that's another common near-miss in fast typing.
Examples in context
Seeing both words in real sentences cements the distinction faster than any rule.
Won't in a sentence: "The committee won't vote until all members are present." Substituting "will not" works perfectly. Wont as a noun: "She stayed late at the office, as was her wont." Substituting "will not" makes no sense. Wont as an adjective: "He was wont to hum quietly while he worked." Again, "will not" can't replace it.
The adjective form is worth practising separately, because it follows an older grammatical pattern. "He is wont to" means "he tends to" or "he is in the habit of." It's not a phrase you'll use in a text message, but it reads naturally in an essay or a work of fiction. Writers who handle similar precision questions, like the difference between tore and torn, usually find that seeing the forms side by side is the fastest path to getting them right.
Common mistakes to avoid
The most frequent error is writing wont when you mean won't: "She wont be joining us." That sentence says she is accustomed to be joining us, which isn't the intended meaning. Always check for the apostrophe when expressing refusal or future negation.
The reverse error is rarer but still appears in edited prose: "As was her won't." Here the apostrophe turns a noun into what looks like a partial contraction, and the sentence collapses. The noun form needs no apostrophe.
Finally, don't confuse wont with want. "I wont more coffee" is a double error: it's missing the apostrophe if you mean "will not," and it's a misspelling if you mean "want." Typing quickly is the main culprit. Slow down on sentences where the two words sit close together.
A note on register
Wont (the adjective and noun) belongs to formal and literary English. In most everyday writing, you'd swap it for "habit," "custom," "tend to," or "usually." "As was her habit, she arrived early" carries the same meaning and suits a wider range of tones. Reserve wont for contexts where the slightly elevated register fits: a formal essay, a novel, or a piece of journalism aiming for a precise, classical touch.
Won't, by contrast, fits any register. It's one of the most common contractions in the language and belongs equally in a business email, a novel, and a text message.