n.

The quality or state of being diffident; timidity or shyness.

noun

Reserve in speech, behavior, or dress: demureness, modesty, reticence, self-effacement. See restraint/unrestraint.

n

Definition: hesitancy; lack of confidence
Antonyms: boldness, confidence

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Lack of self confidence. Diffident individuals typically respond to competitive situations with fear of failure, are easily intimidated, and act with trepidation.

IN BRIEF: Lacking confidence.

Ability hits the mark where presumption over-shoots and diffidence falls short. — Nicholas of Cusa (c.1401-1464).