| sleepyhead(adjective, dull, weak, easy, slow) |
| sloppy(adjective, careless, vague, inattentive, absent) |
| slothful(adjective, dull, careless, indifferent, stupid) |
| slow(adjective, dull, weak, easy, relaxed) |
| sluggish(adjective, dull, weak, easy, slow) |
| slumberous(adjective, dull, stupid, idle, weary) |
| snoozy(adjective, dull, weak, easy, slow) |
| somber(adjective, sad, gloomy, miserable, down) |
| somnolent(adjective, dull, relaxed, stupid, weary) |
| sorry(adjective, sad, gloomy, miserable, down) |
| space cadet(expression, careless, remote, distracted, heedless) |
| spacey(careless, remote, distracted, heedless, scatterbrained) |
| spellbound(adjective, anxious, distant, distracted, absorbed) |
| spiritless(adjective, dull, weak, easy, slow) |
| spread out(expression, adjective, distracted, absorbed, engaged) |
| starry eyed |
| static(adjective, quiet, flat, indifferent, apathetic) |
| stoic(adjective, indifferent, unconcerned, uncaring, passive) |
| stolid(adjective, quiet, indifferent, weary, apathetic) |
| stretchy(adjective, dull, stupid, idle, weary) |