1. lacking confidence in oneself; shy and hesitant

Examples

• She was too diffident to speak up during the meeting.
• His diffident manner made it hard for him to make friends.
• The diffident student rarely volunteered answers in class.
• Despite her talent, she remained diffident about her abilities.
• He gave a diffident smile when complimented on his work.
• The new employee seemed diffident around her colleagues.