| intractable(adjective, difficult, unpleasant, adverse, unfortunate) |
| headstrong(adjective, tough, difficult, awkward, obstinate) |
| immovable(adjective, tough, difficult, obstinate, stubborn) |
| impersuasible |
| inflexible(adjective, obstinate, stubborn, willful, obdurate) |
| mulish(adjective, tough, difficult, awkward, obstinate) |
| obstinate(adjective, tough, difficult, wild, awkward) |
| perverse(adjective, tough, difficult, unpleasant, awkward) |
| pigheaded(adjective, tough, difficult, awkward, obstinate) |
| self-willed(adjective, tough, difficult, wild, awkward) |
| stubborn(adjective, tough, difficult, wild, awkward) |
| unbending(adjective, tough, difficult, obstinate, stubborn) |
| unyielding(adjective, tough, difficult, unpleasant, wild) |
| adamant |
| adamantine |
| awkward(adjective, tough, difficult, unpleasant, wild) |
| bullheaded |
| cantankerous(adjective, tough, difficult, wild, awkward) |
| closed |
| closed to |