Diffident is an adjective that describes someone who lacks confidence in their abilities or is hesitant to assert themselves. A diffident person may be shy, self-doubting, or insecure.

To be diffident means to be very shy and lacking in confidence. An example of a sentence would be: "Casey was diffident because of her background".

yes because for example sentence she was diffident about her opinion

Synonyms include bashful, shy, meek, diffident, timorous, hesitant, or introverted.

Dissident