in-, not, non, -ept, つなぐ、つかむ、達成する, 語源的にはaptitude, adeptと同じ。
英語の語源
inept (adj.)
c. 1600, from Old French inepte (14c.) or directly from Latin ineptus "unsuitable, improper, absurd, awkward, silly, tactless," from in- "not, opposite of" (see in- (1)) + aptus "apt" (see apt). Related: Ineptly; ineptness.
例文
1. She was left feeling inept and inadequate.
彼女は不器用で無能だと感じられた。
2.Whan inept remark to make on such a formal occasion.
このような公式な場で、どうしてこんな不適切なことを言うのか。
3.He was an inept politician.
彼は無能な政治家だ。
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4.He 's quite inept at tennis.
彼はテニスが下手すぎる。
5.He was inept and lacked the intelligence to govern.