sleek /sliːk/adjective 6verb 3adverb 1noun 1forms 5 adjective6 •Having an even, smooth surface; smoothSo sleek her skin, so faultless was her make. — 1717 •Glossy. •Not rough or harsh.Those rugged names to our like mouths grow sleek. — 1673 •Slim and streamlined; not plump, thick, or stocky.But if it were like a rabbit that Rosa went, she came back like a weasel or some such sleek and lissom creature. — 1961 •Healthy, well-fed and well-groomed; in good condition. •(old-fashioned) Dated form of slick (“convincing but untrustworthy”).'Are these the Carrara marbles?' the lady queried. 'Yes, madam,' responded the sleek salesman. — 1892 verb3 •To make smooth or glossy; to polish.The sloping brush sleeks the surface. — 1895 •(old-fashioned) To calm or soothe. •(old-fashioned) To glide. adverb1 •(informal, old-fashioned) With ease and dexterity. noun1 •That which makes smooth; varnish. formssleeked · sleeking · sleeks · sleeker · sleekest