| shy(adjective, feel doubt) |
| unsure(adjective, uncertain, nervous, doubtful, hesitant) |
| diffident(adjective, uncertain, nervous, worried, hesitant) |
| timid(adjective, uncertain, self-doubting, feel doubt) |
| insecure(adjective, uncertain, nervous, doubtful, worried) |
| hesitant(adjective, uncertain, nervous, doubtful, worried) |
| uncertain(adjective, nervous, doubtful, worried, hesitant) |
| self-conscious(adjective, feel doubt) |
| anxious(adjective, uncertain, nervous, worried, hesitant) |
| doubtful(adjective, uncertain, nervous, shaky, dubious) |
| timorous(adjective, feel doubt) |
| introverted(adjective, feel doubt) |
| fearful(adjective, feel doubt) |
| nervous(adjective, insecure, unsure) |
| retiring(adjective, feel doubt) |
| worried(adjective, uncertain, nervous, hesitant, insecure) |
| bashful |
| apprehensive(adjective, uncertain, nervous, worried, hesitant) |
| inhibited(adjective, feel doubt) |
| jumpy(adjective, uncertain, nervous, worried, hesitant) |