| unrhythmical(adjective, irregular) |
| unsound(adjective, careless, loose, unstable, shaky) |
| untrustworthy(adjective, weak, loose, uncertain, doubtful) |
| vicissitudinous(adjective, changeable) |
| aberrant(adjective, irregular, unreliable, uneven, unbalanced) |
| ambiguous(doubtful, vague, uneven, unsure, unbalanced) |
| argument |
| chancy(delicate, doubtful, vague, changeable, tricky) |
| dicey(irregular, unpredictable, unreliable, changeable, erratic) |
| disconnected(unreliable, uneven) |
| discontinuous(adjective, unreliable, uneven, random, capricious) |
| disorderly(adjective, upset, uncertain, anxious, worried) |
| divergent(adjective, uneven, unbalanced, lopsided, asymmetrical) |
| dizzy(unreliable, changeable, uneven, unbalanced, erratic) |
| fallible(adjective, unpredictable, fickle, undependable, fly-by-night) |
| hesitant(doubtful, vague, changeable, unsure, questionable) |
| hesitating(adjective, uncertain, undecided, vacillating) |
| iffy(adjective, uncertain, irregular, doubtful, vague) |
| incalculable(irregular, doubtful, vague, hesitant, unreliable) |
| insecure(adjective, doubtful, vague, uneven, untrustworthy) |