1. refulgent, effulgent, lustrous, lucent, beaming, lambent. Bright, brilliant, radiant, shining refer to that which gives forth, is filled with, or reflects light. Bright suggests the general idea: bright flare, stars, mirror. Brilliant implies a strong, unusual, or sparkling brightness, often changeful or varied and too strong to be agreeable: brilliant sunlight. Radiant implies the pouring forth of steady rays of light, especially as are agreeable to the eyes: a radiant face. Shining implies giving forth or reflecting a strong or steady light: shining eyes. 4. keen, discerning, sharp, sharp-witted, ingenious, clever. 8. promising, encouraging.