radiant

/ˈreɪdiənt/
adjective
  1. Sending out light or heat; shining brightly.
    • A radiant light came from the lighthouse, guiding ships to shore.
    • The campfire cast a radiant glow on the faces of the campers.
    • The radiant sun warmed the cold winter day.
  2. Showing great happiness, love, or health; glowing with emotion.
    • His radiant smile made everyone feel welcome.
    • The new parents were radiant with joy as they held their baby.
    • She looked absolutely radiant in her graduation gown.
Antonyms
noun
  1. A point or object from which light or heat rays are given out.
    • In the diagram, the radiant is shown as a small dot at the center.
    • The meteor shower seemed to come from a single radiant in the sky.
    • The sun is the primary radiant of heat and light for our planet.