sleeper, n. slumberer; drone, sluggard; tie; joist.

sleepiness, n. drowsiness, somnolence.

sleeping, a. asleep, slumbering, dormant.

sleepless, a. wakeful, insomnious, insomnolent.

sleeplessness, n. wakefulness, insomnia, insomnolence.

sleep of plants. nyctitropism.  Associated Word:  nyctitropic.

sleepwalker, n. somnambulist, noctambulist, somnambulator, somnambule.

sleepwalking, n. somnambulism, somnambulation, somnambulance, noctambulism, noctambulation.  Associated Words:  somnambulate, somnambulistic, somnambular, somnambulic.

sleepy, a. drowsy, somnolent, dozy; soporiferous, somniferous, soporific, dormitive, narcotic, somnific, hypnotic; dormant, sluggish, lethargic, torpid, dull.

sleeve, n.  Associated Word:  chevron.

sleigh, n. cutter, sled, sledge, bobsled, toboggan, jumper, pung.

sleight of hand. prestidigitation, jugglery, legerdemain, magic, conjury.  Associated Words:  prestidigitator, juggler, conjurer, magician, legerdemamist.

slender, a. slim, slight, thin, spare, lank, spindling; delicate, feeble, fragile, frail, tenuous; trivial, inconsiderable; abstemious, frugal, spare, plain.

slice, n. chop, collop; rasher, flitch.

slick, a. sleek, sleeky, smooth.

slide, n. slip; flume, shoot, chute.

slide, v. slip, glide, lapse, elapse, skid.

slight, a. inconsiderable, trivial, insignificant, trifling, petty, paltry; desultory, cursory, superficial, indifferent.

slight, n. neglect, inattention, disregard, snub.

slight, v. overlook, neglect, disregard, ignore.

slightly, adv. somewhat; superficially, cursorily, hastily.

slim, a. thin, gaunt, poor, lank, spare, spindling, meager; slight, insufficient, inconsiderable, paltry.

slime, n. mud, mire, ooze, liman.

slimsy, a. (Colloq.) flimsy, frail, poor.

slip, v. slide, glide; err, trip; omit, lose; foist; elapse.

slip, n. lapse, error, indiscretion, transgression, peccadillo, mistake; twig, cutting, scion, shoot; escape, riddance, desertion; wrapper, covering.

slipper, n. slipshoe; (Oriental) baboosh, babouche.

slipperiness, n. smoothness, glibness, lubricity.

slippery, a. smooth, glib; inconstant, unstable; loose, incontinent, lubric.

slipshod, a. slovenly, careless, negligent.

slit, n. gash, incision.

sliver, n. splinter.

slobber, v. drivel, drool, slabber, slaver; smear, daub, defile.

slogan, n. war cry, rallying cry.

slope, v. slant, incline.

slope, n. inclination, slant, obliquity, acclivity; declivity.

sloping, a. oblique, slanting; acclivous; declivous.

slosh, n. slush, sludge.

sloth, n. sluggishness, indolence, laziness.

slothful, a. dronish, lazy, indolent, supine, sluggish, idle, inactive.