diffidence

The story

1. Latin · derived fromdiffīdentiam“distrust”
2. English todaydiffidence

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.