Sleet, "I will not sleet my love to greet" (WS[172],c), neglect.
Sleight (passim), art, skill, dexterity, expertness: generic in both a good and bad sense.
Sliped, "sliped down to the hard knee" (N[77],c), sloped: note the rhyme with "striped."
Slipper, "A slipper sugar-mouthed whorecop" (R[212],c), "the ground be slipper and sliding" (JE[363],d), slippery. "I know they bee slipper that I have to do wyth, and there is no holde of them."—Barnes, Workes (1573), p. 283.
Slither, "make you to slither" (M[7],c), slide, glide: still dialectical.
Slouthy, see Flouthy.
Smattering, "a smattering face" (M[27],b),? a wanton face: cf. smoterlich = wanton; also smorterest place (N[95],a), place being considered as a misprint for "piece."
"We wyll have cousynge Besse also,
And two or thre proper wenchis mo,
Ryght feyr and smotter of face."—
Four Elements, Anon. Pl., 1 Ser. (E.E.D.S.), 22,b.