Diffident means shy and lacking confidence in yourself. A diffident manner, diffident about his work, oddly diffident.
It is about self-doubt rather than about liking people, which is what separates it from shy or reserved. The Latin means mistrusting, and defiant is the same word arrived by another road.
1adjectivediffidentShy and lacking confidence in yourself.
“A diffident student, he rarely spoke in class even when he knew the answer.”
diffident is a quality.
Latin diffidens means mistrustful, from dis- plus fidere, to trust; defiant is a doublet.
Proto-Indo-European
*bʰeydʰ-
Latin
diffīdentem
English, today
diffident
Built from
From Latin diffīdentem, present participle of diffīdere (“to mistrust”). a doublet of defiant.
Etymology from Wiktionary, CC BY-SA