| uncertain(adjective, nervous, unstable, hesitant, fearful) |
| unconfident(adjective, feel doubt) |
| unforthcoming(adjective, quiet, restrained, detached, thoughtful) |
| unpretentious(adjective, quiet, modest, meek, unassuming) |
| withdrawn(adjective, quiet, modest, thoughtful, meek) |
| yellow-bellied(adjective, weak, soft, base, fearful) |
| blushing(quiet, modest, shy, meek, timid) |
| chary(adjective, shy, meek, timid, unassuming) |
| chicken-livered |
| doubtful(adjective, feel doubt) |
| gutless(adjective, weak, soft, base, fearful) |
| ineffectual(adjective, soft, uncertain, nervous, unstable) |
| inhibited(adjective, feel doubt) |
| irresolute(adjective, gentle, uncertain, modest, nervous) |
| overmodest(shy, timid, modesty, diffident) |
| spiritless(nervous, shy, fearful, cowardice) |
| standoffish(adjective, quiet, simple, gentle, restrained) |
| tentative(adjective, quiet, modest, nervous, shy) |
| alarmed(shy, worried, fearful, afraid, suspicious) |
| aloof |