slick adjective (SKILLFUL). › ​operating or ​performing skillfully and ​effectively and without ​seeming to ​try hard: Maz was such a slick ​fielder, one of the ​best in ​baseball. › Slick can sometimes ​mean skillful and ​effective but ​lacking in sincerity: He was a slick ​politician with an ​answer for everything.