| clingy(adjective, precise, thorough, meticulous, sticky) |
| devoted(adjective, strong, firm, determined, steady) |
| dour |
| durable(adjective, strong, sound, secure, tough) |
| earnest(adjective, serious, resolute, persistent, unwavering) |
| faithful(adjective, firm, true, fixed, resolute) |
| hard-nosed(adjective, determined, resolute, obstinate, uncompromising) |
| hardy(adjective, strong, sound, tough, solid) |
| intractable(adjective, tough, firm, difficult, persistent) |
| long |
| mucilaginous(adjective, sticky, viscous) |
| persisting(adjective, strong, firm, determined, resolute) |
| stiff-necked(adjective, tough, firm, resist, unreasonable) |
| unbending(adjective, clear, strong, tough, severe) |
| undaunted(adjective, strong, tough, firm, steady) |
| balky(tough, firm, unreasonable, grim, inflexible) |
| bigoted(adjective, determined, resolute, obstinate, uncompromising) |
| bound(adjective, strong, flat, firm, solid) |
| bovine(adjective, determined, resolute, obstinate, uncompromising) |
| bull-headed(adjective, determined, resolute, obstinate, stubborn) |