impervious

Spelling & Dictionary Insight

The English entry for impervious is 10 letters long, classified as anadj, and transcribed in the International Phonetic Alphabet as /ɪmˈpɜːvi.əs/. Corpus data places it at rank #33,680 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it.Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.

Our Hunspell-derived misspelling index lists 14 documented wrong-spelling variants for impervious, with forms such as "imeprvious", "immpervious", and "imperivous". 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, "imperious", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Latin impervius (“that cannot be passed through”), from in- (“not”) + pervius (“letting things through”). 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 impervious, spelled I-M-P-E-R-V-I-O-U-S, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.