ill

Spelling & Dictionary Insight

The English entry for ill is 3 letters long, classified as anadj, and transcribed in the International Phonetic Alphabet as /ɪl/. Corpus data places it at rank #1,946 in overall English word frequency, indicating it appears regularly in written and spoken text.Wiktionary records 10 distinct senses for this headword, so context determines which meaning a reader should apply.

No frequent misspelling variants are recorded for ill in our index, suggesting the orthography either follows predictable English patterns or the word is uncommon enough that typo corpora lack signal.It also participates in 20 confusable-pair relationships, "in", "is", "it", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English ille (“evil; wicked”), from Old Norse íllr (adjective), ílla (adverb), ílt (noun), from Proto-Germanic *ilhilaz, from Proto-Indo-European *h₁elḱ- (whence Latin ulcus (“sore”), Ancient Greek ἕλκος (hélkos, “wound, ulcer”), Sanskrit अर्शस्… Root origin matters for spelling because borrowed morphemes (Greek, Latin, Old French, Old English) carry their source-language orthographic conventions into modern English, which is why historical etymology is often the cleanest predictor of whether a cluster like "-ough", "-eau", or "-tion" will appear. For readers arriving here from a spelling check, the authoritative guidance is: the correct English form is ill, spelled I-L-L, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.