free from projections or unevenness of surface; not rough

smooth wood; a smooth road.

generally flat or unruffled, as a calm sea.

free from hairs or a hairy growth

a smooth cheek.

of uniform consistency; free from lumps, as a batter, sauce, etc.

free from or proceeding without abrupt curves, bends, etc.

a smooth ride.

allowing or having an even, uninterrupted movement or flow

smooth driving.

easy and uniform, as motion or the working of a machine.

having projections worn away

a smooth tire casing.

free from hindrances or difficulties

a smooth day at the office.

noting a metal file having the minimum commercial grade of coarseness for a single-cut file. Compare dead-smooth .

undisturbed, tranquil, or equable, as the feelings, temper, etc.; serene

a smooth disposition.

elegant, easy, or polished

smooth manners.

ingratiatingly polite or suave

That salesman is a smooth talker.

free from harshness, sharpness, or bite; bland or mellow, as cheese or wine.

not harsh to the ear, as sound

the smooth music of a ballroom dance band.

Phonetics . without aspiration.

in a smooth manner; smoothly.

to make smooth of surface, as by scraping, planing, or pressing.

to remove (projections, ridges, wrinkles, etc.) in making something smooth (often fol. by away or out ).

to free from difficulties.

to remove (obstacles) from a path (often fol. by away ).

to make more polished, elegant, or agreeable, as wording or manners.

to tranquilize, calm, or soothe (a person, the feelings, etc.).

Mathematics . to simplify (an expression) by substituting approximate or certain known values for the variables.

act of smoothing

She adjusted the folds with a smooth of her hand.

something that is smooth; a smooth part or place

through the rough and the smooth.

smooth over, to make seem less severe, disagreeable, or irreconcilable; allay; mitigate

He smoothed over my disappointment with kind words.

adjective

broken , coarse , intermittent , irregular , rough , uneven , wrinkled , uncool , abrupt

verb

coarsen , roughen , wrinkle , aggravate , agitate , incite , irritate , upset

adjective

bland , continuous , creamy , easy , effortless , equable , even , flat , fluent , fluid , flush , frictionless , gentle , glassy , glossy , hairless , horizontal , invariable , lustrous , mild , mirrorlike , monotonous , peaceful , plain , planate , plane , polished , quiet , regular , rhythmic , rippleless , serene , shaven , shiny , silky , sleek , soft , soothing , stable , steady , still , tranquil , unbroken , undeviating , undisturbed , uneventful , uniform , uninterrupted , unruffled , untroubled , unvarying , velvety , agreeable , civilized , courteous , courtly , facile , genial , glib , ingratiating , mellow , persuasive , pleasant , polite , slick , smarmy , unctuous , urbane , level , planar , straight , balmy , delicate , faint , simple , flowing , graceful , abraded , amiable , dolce , flattering , glabrate , glabrescent , glabrous , glace , glary , insinuating , legato , levigate , levigated , marmoreal , marmorean , mellifluous , oily , oleaginous , placid , saponaceous , slippery , smooth-tongued , suave , velutinous , voluble

verb

burnish , clear , even , flatten , flush , glaze , gloss , grade , iron , lay , level , make uniform , perfect , plane , polish , press , refine , round , sand , sleek , slick , varnish , allay , alleviate , appease , assuage , calm , comfort , cool * , ease , extenuate , facilitate , iron out , mellow , mitigate , mollify , palliate , pat , pave the way , soften , stroke , take the edge off , take the sting out , flat , straighten , bland , civilize , courteous , creamy , easy , easygoing , edulcorate , effortless , equable , evenly , flowing , fluent , gentle , glossy , hairless , harmonious , levigate , methodical , mild , pave , persuasive , placid , planish , pleasant , polished , preen , satiny , serene , silky , sleeky , slick as a whistle , soft , soothe , soothing , suave , tranquil , tranquilize , undisturbed , uninterrupted , unruffled , unwrinkled

phrasal verb

reconcile , rectify , resolve , straighten out