Definition of happy :
1. Dexterous; ready; apt; felicitous.
2. Experiencing the effect of favorable fortune; having the feeling arising from the consciousness of well- being or of enjoyment; enjoying good of any kind, as peace, tranquillity, comfort; contented; joyous; as, happy hours, happy thoughts.
3. Favored by hap, luck, or fortune; lucky; fortunate; successful; prosperous; satisfying desire; as, a happy expedient; a happy effort; a happy venture; a happy omen.
paradisial, delirious, peppy, clever, zesty, contented, elysian, expansive, golden, keen, adroit, skilful, sad, paradisiac, blithe, debonair, apt, radiant, perky, providential, gifted, halcyon, beatific, capable, expert, crying, carefree, jovial, weeping, tailor-made, talented, bonny, rejoicing, happy-go-lucky, gladsome, frisky, proper, mirthful, charmed, cloudless, beaming, tickled, well-chosen, blessed, rollicking, vivacious, becoming, sportive, dexterous, overjoyed, light, knowing, peaceful, pleasing, fortunate, intelligent, fulfilled, quick, relieved, paradisaical, smart, riant, thrilled, euphoriant, exultant, right, jubilant, satisfied, breezy, laughing, prosperous, lucky, gratified, fitting, fit, appropriate, exuberant, correct, joyous, luck, well, meet, roaring, gleeful, enchanted, convivial, content, frolicsome, playful, paradisiacal, chipper, good-humored, festive, rapturous, gala, able, rapt, intellectual, felicitous, jesting, amusing, jocund, hearty, animated, cheering, comfortable, transported, sorrowful, quick-witted, paradisaic, hilarious, dashing, smiling, elated, intoxicated, joking, nice, ingenious, paradisal, sharp, befitting, delighted, shouting
cheerful (part of speech: adjective)
cordial, lively, glad, affable, complaisant, jolly, buoyant, gay, congenial, jaunty, optimistic, friendly, pleased, merry, amiable, joyful, easygoing, lighthearted, agreeable, sunny, spirited, pleasant, warm, genial, cheerful, bright, cheery, sparkling
pleasant (part of speech: adjective)