| undependable(adjective, uncertain, nervous, unstable, irregular) |
| volatile(adjective, unstable, irregular, unsettled, hesitant) |
| doubtful(adjective, uncertain, unsettled, hesitant, unsure) |
| dubious(adjective, uncertain, doubtful, hesitant, unsure) |
| flighty(adjective, careless, unstable, unsettled, unpredictable) |
| mercurial(adjective, unstable, irregular, unsettled, unpredictable) |
| unreliable(adjective, uncertain, nervous, unstable, irregular) |
| changeful(adjective, careless, unstable, irregular, unsettled) |
| insecure(adjective, weak, delicate, uncertain, nervous) |
| mutable(adjective, unstable, unsettled, unpredictable, unreliable) |
| restless(adjective, anxious, content, unstable, unsettled) |
| variable(adjective, uncertain, unstable, irregular, doubtful) |
| changing(adjective, weak, uncertain, unsettled, vague) |
| feeble(adjective, weak, gentle, delicate, uncertain) |
| half-hearted(adjective, cool, uncertain, shy, doubtful) |
| halfhearted(adjective, cool, weak, enthusiasm, listless) |
| halting(adjective, weak, delicate, uncertain, shy) |
| inconsistent(adjective, unstable, irregular, unsettled, unpredictable) |
| irresponsible(adjective, careless, unstable, unsettled, unpredictable) |
| shifting(adjective, unstable, irregular, unsettled, hesitant) |