5 days ago · sleek, slick, glossy mean having a smooth bright surface or appearance. sleek suggests a smoothness or brightness resulting from attentive grooming or physical conditioning. (especially of hair, clothes, or shapes) smooth, shiny, and lying close to the body, and…. If you describe someone as sleek, you mean that they look rich and stylish. She works an array of different looks - from rock chick to sleek and sophisticated - in the stunning photo collection. smooth or glossy, as hair. finely contoured; streamlined: a sleek sports car. smooth in manners, speech, etc.; suave. Definition of sleek adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. SLEEK definition: smooth or glossy, as hair, an animal, etc. See examples of sleek used in a sentence. meanings, etymology, pronunciation and more in the Oxford English Dictionary.