1. (adjective) lacking self-confidence

• diffident
• shy
• timid

2. (adjective) lacking or indicating lack of confidence or assurance

• incertain
• uncertain

1. (adjective) lacking or indicating lack of confidence or assurance

• ambivalent
• doubtful
• dubious
• groping

1. (adjective) lacking self-confidence

• confident

2. (adjective) lacking or indicating lack of confidence or assurance

• certain
• certain
• sure
• sure

1. (adjective) lacking self-confidence

• diffidence
• self-distrust
• self-doubt
• shyness
• timidity
• timidness
• timorousness

2. (adjective) lacking or indicating lack of confidence or assurance

• precariousness
• uncertainness
• uncertainty