出典:Wiktionary
From Latin diffīdentiam (“distrust”), from diffīdere (“to mistrust”), from dis- and fīdere (“to trust”). Attested since ∼1400. The original sense was antonymous with confidence, and the modern sense of ‘distrusting oneself’ dates from the 1650s.[1]
diffidence (countable かつ uncountable, 複数形 diffidences)