| well-balanced(adjective, strain, firmness, labour, hardiness) |
| relentless(adjective, strong, tough, firm, determined) |
| robust(adjective, strain, firmness, labour, hardiness) |
| tireless(adjective, determined, resolute, tenacious) |
| unrelenting(adjective, certain, determined, resolute, persistent) |
| devoted(adjective, good, close, strong, kind) |
| indefatigable(adjective, resolute, persevering, tenacious, untiring) |
| dependable(adjective, good, close, strong, correct) |
| reliable(adjective, calm, close, strong, secure) |
| unflagging(adjective, perseverance, persevering, tenacious) |
| dedicated(adjective, clear, kind, tough, severe) |
| sure(adjective, calm, good, close, strong) |
| unbendable(adjective, determined, resolute, obstinate, uncompromising) |
| unchanging(adjective, close, correct, firm, honest) |
| abiding(adjective, calm, strong, complete, secure) |
| solid(adjective, calm, good, strong, secure) |
| unchangeable(adjective, calm, strong, secure, flat) |
| undeviating(adjective, strong, flat, firm, solid) |
| changeless(adjective, firm, solid, certain, steady) |
| immutable(adjective, calm, strong, secure, firm) |