harlequinEnglishOxford American Thesaurusharlequin noun jester, joker, merry andrew, droll; rare zany.adjective a harlequin pattern: varicolored, variegated, colorful, particolored, multicolored, multicolor, many-colored, many-hued, rainbow, jazzy, kaleidoscopic, psychedelic, polychromatic, checkered; informal (looking) like an explosion in a paint factory; rare motley. ▷antonyms plain.