sad
adjective
1. feeling or showing sorrow; unhappy.
"I was sad and subdued"
synonyms: unhappy, sorrowful, dejected, regretful, depressed, downcast, miserable, downhearted, down, despondent, despairing, disconsolate, out of sorts, desolate, bowed down, wretched, glum, gloomy, doleful, dismal, blue, melancholy, melancholic, low-spirited, mournful, woeful, woebegone, forlorn, crestfallen, broken-hearted, heartbroken, inconsolable, grief-stricken; informaldown in the mouth, down in the dumps
"every one of us felt sad at having to part company"
antonyms: happy, cheerful
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radiation
noun
1.
PHYSICS
the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
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sadiation
false noun
1. me