DIFFIDENT, adjective

1. 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 diffident

3. Reserved; modest; timid; as a diffident youth.