Synonyms for "optimist": good sport, eager beaver, utopian, brightness, dreamer, booster, bullish, sanguine, sunshine, whistler, golden, idealist, trustful, expectant, radiance, sunny, cheerful, bright, warm, hopeful, upbeat, radiant, brilliant, delightful, buoyant, sunny side, happy, joyful, rosy, pollyanna, never say die, bright spark, positive, optimistic, ray of sunshine, happy camper, visionary, delighted.