| obdurate(adjective, tough, difficult, contrary, obstinate) |
| restive(adjective, negative, hostile, different, restless) |
| unpredictable(adjective, careless, unstable, unreasonable, contrary) |
| unstable(adjective, careless, unreasonable, irregular, unreliable) |
| variable(adjective, careless, unstable, unreasonable, irregular) |
| volatile(adjective, careless, unstable, unreasonable, irregular) |
| wanton(adjective, cruel, extravagant, malicious, caprice) |
| wilful |
| cantankerous(difficult, wild, awkward, persistent, obstinate) |
| bad(adjective, wicked) |
| balky(adjective, support, attitude, negative, hostile) |
| business-minded |
| freakish(adjective, unusual, careless, unstable, unreasonable) |
| impulsive(adjective, unusual, careless, unstable, unreasonable) |
| inconsistent(adjective, wild, negative, hostile, irregular) |
| inconstant(adjective, careless, unstable, unreasonable, irregular) |
| irregular(adjective, unpredictable, unreliable, motiveless) |
| mulish(adjective, tough, difficult, awkward, contrary) |
| pigheaded(adjective, tough, difficult, awkward, obstinate) |
| crotchety(adjective, careless, unstable, unreasonable, unpredictable) |