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radiant 
1 beaming, bright, brilliant, effulgent, gleaming, glittering, glorious, glowing, incandescent, luminous, lustrous, resplendent, shining, sparkling, sunny 
2 beaming, beatific, blissed out, blissful, delighted, ecstatic, floating on air, gay, glowing, happy, joyful, joyous, on cloud nine  (informal) rapt, rapturous, sent 
 
Antonyms  
 
1 black, dark, dull, gloomy, sombre 
2 disconsolate, down in the dumps  (informal) gloomy, joyless, low, miserable, sad, sombre, sorrowful