DiffidentDIFFIDENT, adjective1. Distrustful; wanting confidence; doubting of anothers power, disposition, sincerity or intention.Be not diffident of wisdom.Be diffident in dealing with strangers.2. Distrustful of ones self; not confident; doubtful of ones own power or competency.Distress makes the humble heart diffident3. Reserved; modest; timid; as a diffident youth.