| quiescent(adjective, dull, idle, sluggish, lazy) |
| quiet(dull, idle, sluggish, lazy, motionless) |
| refractory(adjective, hard, firm, solid, tense) |
| reinforced |
| relentless(adjective, determined, resolute, uncompromising, unshakeable) |
| reliable(adjective, even, rigid, inflexible, consistent) |
| resistant(adjective, hard, firm, solid, tense) |
| rheumatic(adjective, hard, firm, solid, tense) |
| rigid(adjective, hard, firm, solid, stiff) |
| ropy(heavy, dense, syrupy, concentrated, viscous) |
| sclerotic |
| sedentary(adjective, dull, idle, sluggish, lazy) |
| self-willed(adjective, determined, resolute, uncompromising, unshakeable) |
| slack(dull, sluggish, lazy, motionless, unmoving) |
| sleepy(adjective, dull, idle, sluggish, lazy) |
| sloppy(heavy, dense, syrupy, concentrated, viscous) |
| slothful(dull, idle, sluggish, lazy, motionless) |
| slow(dull, idle, sluggish, lazy, motionless) |
| somnolent(adjective, dull, idle, sluggish, lazy) |
| stable(adjective, dull, idle, even, sluggish) |