Inappropriateness is the ordinary noun for not being suitable or not being right in a particular situation. If inappropriacy is the slightly more academic twin, this is the one you will meet more often in everyday English, especially American English.

Inappropriateness isinappropriateness是 the ordinary noun for用來說 not being suitable or not being right不合適或不恰當 in a particular situation在特定情況下的一般名詞。If inappropriacy is如果inappropriacy是 the slightly more academic twin稍微學術一點的雙胞胎字，this is the one這個字才是 you will meet more often in everyday English你在日常英語裡更常遇到的，especially American English尤其是美式英語。

We use it about comments, clothes, timing, and behaviour: the inappropriateness of phones at dinner, of a joke that went too far, of a gift that was too personal.

We use it about我們會用這個字來說 comments, clothes, timing, and behaviour言語、穿著、時機和行為：the inappropriateness of phones at dinner晚餐時用手機的不恰當、of a joke that went too far一個玩笑開過頭的不恰當、of a gift that was too personal一份過於私人的禮物的不恰當。

Though actually it still names fit, not evil. A kind sentence can have inappropriateness if the moment is wrong.

Though actually不過其實 it still names它指的仍然是 fit, not evil合不合適，而不是善惡。A kind sentence一句好心的話 can have inappropriateness也可能有inappropriateness if the moment is wrong如果時機不對的話。

It is a little formal — in speech people often say “that was not appropriate” instead of naming the noun — but it is not rare, and students will see it in school rules and workplace writing.

It is a little formal這個字有點正式—in speech people often say口語裡大家常說 that was not appropriate「that was not appropriate」instead of naming the noun而不是直接講這個名詞—but it is not rare但它並不罕見，and students will see it學生會看到它 in school rules and workplace writing在校規和職場文件裡。