Part of speech: Adjective
showing modest reserve
Example: she was diffident when offering a comment on the professor's lecture
Part of speech: Adjective
lacking self-confidence
Example: stood in the doorway diffident and abashed; problems that call for bold not timid responses; a very unsure young man
The word "diffident" was borrowed from Latin diffīdentem.
defiant – A related word in the same word family.
Many Latin words entered English twice—once through French and once through direct borrowing.