Synonyms for Happy:

adj.

beatific (adjective)
euphoric.
carefree (adjective)
radiant, at ease.
cheerful (adjective)
affable, agreeable, amiable, bright, buoyant, cheerful, cheery, complaisant, congenial, cordial, easygoing, friendly, genial, glad, good-humored, happy-go-lucky, jaunty, jolly, joyful, lighthearted, lively, merry, optimistic, pleasant, pleased, sparkling, spirited, sunny, warm.
content (adjective)
satisfied.
in high spirits; satisfied (adjective)
blessed, blissful, blithe, cheerful, chipper, content, contented, convivial, delighted, ecstatic, elated, exultant, glad, gleeful, gratified, intoxicated, jolly, joyful, joyous, jubilant, laughing, light, lively, merry, mirthful, overjoyed, peaceful, peppy, perky, playful, pleasant, pleased, sparkling, sunny, thrilled, Tickled.
lively (adjective)
animated.
lucky (adjective)
appropriate, befitting, correct, felicitous, fitting, fortunate, meet, nice, proper, providential, right.
pleasant (adjective)
blissful, delightful, ecstatic, euphoric, exhilarating, gratifying, likeable, pleasurable, satisfying, cheerful, joyful, pleasant.
rapturous (adjective)
rapturous.
suitable (adjective)
proper.

n.

animated, attractive, beatific, blithe, bonny, breezy, carefree, charmed, chipper, cloudless, comfortable, convivial, dashing, debonair, delighted, delirious, elated, enchanted, enjoyable, exuberant, exultant, fit, frisky, frolicsome, gladsome, gleeful, good-humored, gratified, happy-go-lucky, hearty, hilarious, intoxicated, jocund, jovial, jubilant, light, lovely, mirthful, overjoyed, peaceful, peppy, perky, playful, radiant, rapt, rapturous, rejoicing, relaxing, relieved, restful, rollicking, sad, satisfied, smiling, sorrowful, sportive, thrilled, vivacious, well, zesty, Tickled, Transported. alive, amusing, cheering, crying, festive, jesting, joking, roaring, shouting, weeping. at ease, calm, chilled, composed, cool, laid-back, nice, nonchalant, relaxed, right, at one with. luck, lucky, providential, many happy returns, Merry Christmas, season's greetings, happy birthday. fulfilled. pleasing. gala. appropriate, becoming, befitting, correct, fitting, meet, proper, tailor-made. happy (noun)
blessed, blissful, bright, content, contented, elysian, euphoriant, euphoric, expansive, felicitous, fortunate, golden, halcyon, joyful, joyous, laughing, paradisaic, paradisaical, paradisal, paradisiac, paradisiacal, paradisial, pleased, prosperous, riant, well-chosen.

Other synonyms:

befitting, comfortable, content, fit, gladsome, gratified, intoxicated, Tickled. appropriate, becoming, breezy, fitting, fulfilled, proper, providential, sorrowful, tailor-made, weeping. debonair. convivial, pleasing. right. animated
thrilled.
blissful
beatific.
captivated
enchanted.
convivial
jovial.
cordial
hearty.
enraptured
overjoyed, rapt.
exhilarated
elated.
exulting
exultant.
festive
gala.
frolicsome
playful.
high-spirited
exuberant.
in good spirits
chipper.
in low spirits
sad.
joyous
gleeful, joyous.
lighthearted
carefree.
merry
festive.
rejoicing
jubilant.
shining
radiant.
spirited
animated, vivacious.
Other relevant words:
alive, amusing, animated, appropriate, at ease, attractive, beatific, becoming, befitting, blessed, blithe, bonny, breezy, calm, carefree, charmed, cheering, chilled, chipper, cloudless, comfortable, composed, content, contented, convivial, cool, correct, crying, dashing, debonair, delighted, delirious, elated, elysian, enchanted, enjoyable, euphoriant, expansive, exuberant, exultant, felicitous, festive, fit, fitting, fortunate, frisky, frolicsome, fulfilled, gala, gladsome, gleeful, golden, good-humored, gratified, halcyon, happy-go-lucky, hearty, hilarious, intoxicated, jesting, jocund, joking, jovial, joyous, jubilant, laid-back, laughing, light, lovely, luck, lucky, meet, mirthful, nice, nonchalant, overjoyed, paradisaic, paradisaical, paradisal, paradisiac, paradisiacal, paradisial, peaceful, peppy, perky, playful, pleasing, proper, prosperous, providential, radiant, rapt, rapturous, rejoicing, relaxed, relaxing, relieved, restful, riant, right, roaring, rollicking, sad, satisfied, shouting, smiling, sorrowful, sportive, tailor-made, thrilled, vivacious, weeping, well, well-chosen, zesty, Tickled, Transported.

Usage examples for happy

  1. Could she ever be happy again? – The Macdermots of Ballycloran by Anthony Trollope
  2. We were happy over there. – The Hollow of Her Hand by George Barr McCutcheon
  3. I can never be happy with you. – Dora Thorne by Charlotte M. Braeme