<p><strong>Adjective</strong></p><ul><li>smooth·er, smooth·est</li><li>free from projections or unevenness of surface; not rough: smooth wood; a smooth road.</li><li>Synonyms: flat, even, polished, glossy</li><li>generally flat or unruffled, as a calm sea.</li><li>free from hairs or a hairy growth: a smooth cheek.</li><li>of uniform consistency; free from lumps, as a batter, sauce, etc.</li><li>free from or proceeding without abrupt curves, bends, etc.: a smooth ride.</li><li>allowing or having an even, uninterrupted movement or flow: smooth driving.</li><li>easy and uniform, as motion or the working of a machine.</li><li>having projections worn away: a smooth tire casing.</li><li>free from hindrances or difficulties: a smooth day at the office.</li><li>noting a metal file having the minimum commercial grade of coarseness for a single-cut file.</li><li>Compare dead-smooth.</li><li>undisturbed, tranquil, or equable, as the feelings, temper, etc.; serene: a smooth disposition.</li><li>elegant, easy, or polished: smooth manners.</li><li>ingratiatingly polite or suave: That salesman is a smooth talker.</li><li>free from harshness, sharpness, or bite; bland or mellow, as cheese or wine.</li><li>not harsh to the ear, as sound: the smooth music of a ballroom dance band.</li><li>Phonetics: without aspiration.</li></ul><p><strong>Adverb</strong></p><ul><li>in a smooth manner; smoothly.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to make smooth of surface, as by scraping, planing, or pressing.</li><li>to remove (projections, ridges, wrinkles, etc.) in making something smooth (often followed by away or out).</li><li>to free from difficulties.</li><li>to remove (obstacles) from a path (often followed by away).</li><li>to make more polished, elegant, or agreeable, as wording or manners.</li><li>to tranquilize, calm, or soothe (a person, the feelings, etc.).</li><li>Mathematics: to simplify (an expression) by substituting approximate or certain known values for the variables.</li></ul><p><strong>Noun</strong></p><ul><li>act of smoothing: She adjusted the folds with a smooth of her hand.</li><li>something that is smooth; a smooth part or place: through the rough and the smooth.</li></ul><p><strong>Verb Phrase</strong></p><ul><li>to make seem less severe, disagreeable, or irreconcilable; allay; mitigate: He smoothed over my disappointment with kind words.</li></ul>