diffident
adjective
UK/ˈdɪf.ɪ.dᵊnt/
US/ˈdɪf.ɪ.dᵊnt/
Definitions of diffident adjective
Characterized by a lack of self-confidence and shyness.
She responded to the compliment with a diffident smile.
He avoided speaking in public due to his diffident nature.
Despite his talents, he remained diffident about his abilities.