| unreliable(adjective, uneven, variable, erratic, random) |
| unstable(adjective, weak, delicate, uncertain, ill) |
| vague(adjective, weak, uncertain, unsettled, pale) |
| waiting(verb, adjective, uncertain, shy, doubtful) |
| weak-kneed(weak, uncertain, doubtful, indefinite, wavering) |
| wishy-washy(adjective, weak, uncertain, doubtful, indefinite) |
| agnostic(uncertain, hesitant, dubious, unsure) |
| agnosticism(noun, difficulty, anxiety, confusion, doubt) |
| all aquiver(expression, weak, unstable, unsettled, unsteady) |
| ambiguity(noun, difficulty, anxiety, confusion, doubt) |
| ambling |
| anile(adjective, weak, delicate, ill, sick) |
| anxiety(noun, doubt, uncertainty, integrity, morality) |
| anxious |
| apathetic(adjective, unfaithful, disloyal) |
| apprehension(noun, difficulty, anxiety, confusion, doubt) |
| apprehensive |
| aquake(weak, unstable, unsettled, unsteady, trembling) |
| aquiver(weak, unstable, unsettled, unsteady, trembling) |
| ashake(weak, unstable, unsettled, unsteady, trembling) |