112 synonyms for smooth such as clear the way for, as flat as a pancake, calm, easy, courteous, agreeable, even off, cure, aid, and assist. Smooth is an adjective, and its antonyms are uneven, rough, dull, and hirsute.
As flat as a pancake, burnished, clean-shaven, even, featureless, flat, flush, glassy, glossy, hairless, level, lustrous, plane, polished, satiny, sheeny, shiny, silky, sleek, smooth-shaven, unrough, and unwrinkled.
Calm, dead calm, even, flat, glassy, like a millpond, mirror-like, placid, serene, still, tranquil, undisturbed, unruffled, and waveless.
Easy, effortless, plain sailing, simple, straightforward, trouble-free, untroubled, and well ordered.
Courteous, debonair, glib, gracious, ingratiating, media-savvy, oily, persuasive, polished, slick, smarmy, smooth-tongued, sophisticated, suave, unctuous, and urbane.
Agreeable, bland, mellow, mild, pleasant, soft, and soothing.
Even off, even out, flatten, iron, level, level off, level out, make even, make flat, make level, make regular, make uniform, plane, press (down), regularize, roll, and steamroll.
Cure, heal, iron out, mend, patch up, put to rights, rectify, remedy, resolve, settle, and sort out.
Aid, assist, clear the way for, ease, expedite, facilitate, help, help along, lubricate, make easier, make easy, oil, oil the wheels of, open the door for, pave the way for, and smooth the way for.