| sturdy |
| sulky(adjective, mean, irritable, sullen, crabby) |
| sullen(adjective, upset, mean, irritable, sullen) |
| uncontrollable(adjective, control, order, resist, wild) |
| uncooperative(adjective, mean, hard, tough, harsh) |
| unflagging(adjective, tenacious) |
| unregenerate |
| unswayable(adjective, tough, firm, determined, resolute) |
| adamantine(adjective, cruel, determined, resolute, pitiless) |
| balky(adjective, cross, negative, hostile, different) |
| bloody-minded |
| cussed(adjective, mean, cross, irritable, ugly) |
| deaf(adjective, stubborn, unwilling) |
| decided(adjective, firm, intense, deliberate, determined) |
| froward(adjective, determined, negative, hostile, impulsive) |
| grim(adjective, severe, determined, resolute, sullen) |
| hardened(adjective, determined, resolute, stubborn, uncompromising) |
| restive(adjective, determined, negative, nervous, hostile) |
| rigorous(adjective, hard, severe, resolute, rigid) |
| doctrinaire(adjective, opinionated, dogmatic) |