skittish, a. timorous, [shy]; [volatile], [restless], [wanton].
skulk, v. [sneak], slink, lurk.
skull, n. [cranium]; death's-head. Associated words: cranial, acrania, acranial, craniology, [phrenology], trepan, trephine, fontanel, sphenoid, cephalism, parietes, parietal, crossbones, occiput, frontal, sinciput.
skullcap, a. calotte.
sky, n. firmament, welkin, empyrean, azure, the heavens. Associated words: [meridian], [zenith], nadir, horizon, uranology, uranography, zodiac.
sky-blue, a. azure, cerulean.
skyey, a. ethereal.
slack, a. [lax], [loose], relaxed; [remiss], [negligent], [careless], [shiftless]; [inactive], [slow].
slacken, v. [moderate], [retard], [slack], [reduce]; [loosen], [relax]; [diminish], [abate], [mitigate]; [slake]; [relax], [flag].
slackness, n. [looseness], laxity, [negligence], remissness, [carelessness], shiftlessness; [relaxation], [diminution].