| strong(adjective, strain, stiff, firmness, sturdy) |
| hard(adjective, strain, firmness, labour, hardiness) |
| stiff(adjective, strong, strain, firmness, tight) |
| refractory(adjective, strain, firmness, labour, hardiness) |
| resistant(adjective, strong, strain, stiff, firmness) |
| defensive(adjective, strain, firmness, watchful, labour) |
| unyielding(adjective, strain, firmness, labour, hardiness) |
| conservative(adjective, strain, firmness, labour, hardiness) |
| durable(adjective, strain, firmness, labour, hardiness) |
| enduring(adjective, strength, strain, ability, resolution) |
| resilient(adjective, strong, strain, stiff, firmness) |
| rigid(adjective, strong, strain, stiff, firmness) |
| robust(adjective, strain, firmness, labour, hardiness) |
| stout(adjective, strain, firmness, labour, hardiness) |
| tight(adjective, strong, strain, stiff, firmness) |
| stand(noun, verb, conflict, opposition, face-off) |
| dissenting(verb, contending) |
| opposing(verb, watchful, defending, protective, protecting) |
| protesting(verb, contending) |
| recalcitrant(adjective, uncontrollable, disobedient) |