Antonyms for gaily
happily, brightly:solemnly, sadly, unhappily.
noun:gloomily, darkly, severely, sourly, lazily, simply, wearily, plainly, dejectedly, drearily, pessimistically, dolorously, dismally, sorrowfully, sluggishly, sternly, idly, colorlessly, glumly, quietly, dully, listlessly, miserably, tiredly, cheerlessly, morosely, chastely, sulkily, modestly, abjectly, sullenly, bleakly, inconspicuously, plaintively, forlornly, unobtrusively, boringly, unpretentiously, despondently, slothfully, somberly, dispiritedly, halfheartedly, dolefully, tardily, disconsolately, dourly, heavily, conservatively, demurely, indolently, inanimately, drably, lethargically, mournfully, wretchedly.
Synonyms for gaily
airily, ardently, laughingly, glowingly, lovingly, playfully, blissfully, mirthfully, Elatedly, pleasurably, rapturously, with relish, felicitously, paradisiacally, with zeal, delightfully, contentedly, jauntily, flashily, spiritedly, devotedly, gleefully, zestfully, colorfully, merrily, jocundly, flamboyantly, readily, brilliantly, Sparklingly, with good grace, sportively, delightedly, happily, exhilaratingly, enthusiastically, graciously, splendidly, brightly, genially, gaily, gladly, joyfully, ecstatically, light-heartedly, stylishly, lightheartedly, blithely, vivaciously, cheerfully, pleasantly, cheerily, showily, exultantly, beatifically, joyously, with spirit, colourfully, enchantedly, buoyantly, jovially, smartly, with pleasure, pleasingly.