illustrious

Spelling & Dictionary Insight

The English entry for illustrious is 11 letters long, classified as anadj, and transcribed in the International Phonetic Alphabet as /ɪˈlʌs.tɹɪ.əs/. Corpus data places it at rank #19,364 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it.The dominant gloss from Wiktionary reads: "Admired, distinguished, respected, or well-known.".

Our Hunspell-derived misspelling index lists 14 documented wrong-spelling variants for illustrious, with forms such as "illsutrious", "illusrtious", and "illusstrious". Each variant represents a distinct typo pattern that appears often enough in corpora to be worth flagging, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution.It also participates in 1 confusable-pair relationship, "industrious", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Latin illūstris (“bright, shining; distinguished, prominent, illustrious”) + -ous (suffix forming adjectives from nouns, to denote possession or presence of a quality in any degree). Illūstris is derived from illūstrō (“to brighten, illuminate; to make… 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 illustrious, spelled I-L-L-U-S-T-R-I-O-U-S, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.