| periodic(adjective, continue, irregular, sporadic, discontinuity) |
| broken(verb, adjective, irregular, sporadic, discontinuity) |
| uncertain(adjective, unstable, irregular, doubtful, unsettled) |
| whimsical(adjective, free, careless, wild, unstable) |
| volatile(adjective, weak, free, wild, uncertain) |
| wavering(adjective, unstable, doubtful, unsettled, vague) |
| haphazard(adjective, irregular, restless, disturbed, broken) |
| restless(adjective, content, unstable, irregular, unsettled) |
| unsystematic(adjective, irregular, erratic, random, haphazard) |
| shifting(adjective, strange, unstable, fantastic, irregular) |
| eccentric(adjective, irregular, unpredictable, unreliable, uneven) |
| impulsive(adjective, careless, unstable, unreasonable, irregular) |
| recurrent(adjective, irregular, unreliable, variable, broken) |
| frivolous(adjective, free, careless, wild, changeable) |
| irresolute(adjective, unstable, doubtful, unsettled, hesitant) |
| jerky(adjective, rough, irregular, odd, unreliable) |
| mercurial(adjective, cross, careless, melancholy, uncertain) |
| moody(adjective, careless, unstable, unreasonable, changeable) |
| spotty(adjective, irregular, sporadic) |
| unmethodical(adjective, unreliable, uneven, variable, erratic) |