Meanings
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1
adj
lacking self-confidence
Stood in the doorway diffident and abashed.
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2
adj
showing modest reserve
I was diffident when offering a comment on the professor's lecture.
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3
adj
Lacking self-confidence; timid; modest
Having therefore—but hold, as we are diffident of our own abilities, let us here invite a superior power to our assistance.
Thesaurus
Etymology
From Latin diffīdentem, present participle of diffīdere (“to mistrust”). Doublet of defiant.