← BackshareGuessdiffident/ˈdɪfɪdənt/adjectiveLacking confidence in oneself; shy or timid.His diffident manner made it hard for others to get to know him.The diffident student rarely raised his hand in class.She felt diffident about giving a speech in front of so many people.SynonymsshytimidhesitantAntonymsconfidentboldoutgoing