You can picture anodyne as the small bottle that takes the sting out. Something hurts; this is the thing you reach for, and afterwards the hurting is smaller. Nothing has been repaired — the pain has simply been . Once you hold that picture, every other use is the same move applied to something else: a worry , a sadness , and finally a sentence until there is nothing sharp left in it at all.
From the word’s history
From Medieval Latin anodynos, from Ancient Greek anodunos: an- 'without' plus odune 'pain' — literally 'without pain'. The adjective meaning 'noncontentious, bland' probably arrived through French anodin 'harmless, trivial'.
來自中世紀拉丁文 anōdynos，再往前是古希臘文 ἀνώδυνος：an-（沒有）加 ὀδύνη（痛），字面就是「沒有痛」。至於「不痛不癢、四平八穩」這個形容詞用法，可能是經由法文 anodin（無害的、微不足道的）進來的，來源相同。
Wiktionary, "anodyne"
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