sappy

1 appealing to the emotions in an obvious and tiresome way a sappy letter filled with silly romantic clichés Synonyms chocolate-box, cloying, drippy, fruity, gooey, lovey-dovey, maudlin, mawkish, mushy, novelettish, saccharine, corny, schmaltzy, sentimental, sloppy, slushy, soppy, soupy, spoony (or spooney), sticky, sugarcoated, sugary, wetRelated Words dreamy, misty-eyed, moonstruck, moony, nostalgic, starry-eyed; feel-good, fuzzy; melodramatic, soap-operatic, soapy, sudsy; flat, insipid, soft-boiled, tasteless, vapid, watery; cutesy, twee [chiefly British]Near Antonyms unadulterated, unvarnished; antisentimental, cynical, hard-boiled, hard-edged, hardheadedAntonyms unsentimental

2 showing or marked by a lack of good sense or judgment a sappy plan to try to get her divorced parents back together again Synonyms absurd, asinine, balmy, brainless, bubbleheaded, cockeyed, crackpot, crazy, cuckoo, daffy, daft, dippy, dotty, fatuous, featherheaded, fool, half-baked, harebrained, half-witted, inept, insane, jerky, kooky (also kookie), loony (also looney), lunatic, lunkheaded, mad, nonsensical, nutty, preposterous, foolish, screwball, senseless, silly, simpleminded, stupid, tomfool, unwise, wacky (also whacky), weak-minded, witless, zanyRelated Words airheaded, birdbrained, boobish, brain-dead, chowderheaded, chuckleheaded, clueless, dense, dim, dim-witted, doltish, dopey (also dopy), dorky [slang], dull, dumb, dunderheaded, empty-headed, fatuous, feebleminded, gormless [chiefly British], idiotic (also idiotical), imbecile (or imbecilic), knuckleheaded, lamebrain (or lamebrained), mindless, moronic, oafish, obtuse, opaque, pinheaded, simple, slow, slow-witted, soft, softheaded, thoughtless, thick, thickheaded, unintelligent, vacuous, witless; fallacious, illogical, invalid, irrational, nonrational, surd, unreasonable, unreasoning, unsound, weak; farcical, laughable, ludicrous, ridiculous; notional; buffoonish, clownish; ill-advised, unconsidered, unreasonedNear Antonyms brainy, bright, clever, intelligent, smart; logical, rational, reasonable, valid; well-advisedAntonyms judicious, prudent, sagacious, sage, sane, sapient, sensible, sound, wise