| self-willed(tough, difficult, wild, awkward, obstinate) |
| settled(persistent, continuous, hardened, lasting, continuing) |
| sick as a dog(expression, idiom, mean, sick, green) |
| spastic |
| suffering(mean, weak, down, sick, feeble) |
| tenacious(tough, difficult, wild, awkward, persistent) |
| terminal case |
| tottering(mean, weak, down, ill, sick) |
| unabating(persistent, continuous, lasting, continuing, remaining) |
| unbending(tough, difficult, obstinate, stubborn, willful) |
| unchangeable |
| unchanging |
| uncompromising(tough, difficult, obstinate, stubborn, willful) |
| uncooperative(tough, difficult, wild, awkward, obstinate) |
| under medication(expression, mean, weak, sick, green) |
| under the weather(expression, idiom, mean, sick, green) |
| undisciplined(tough, difficult, wild, awkward, obstinate) |
| unfixable(adjective, unchangeable, terminal, irreversible, irreparable) |
| ungovernable(tough, difficult, wild, awkward, obstinate) |
| unhealthy(mean, weak, down, sick, feeble) |