Etymology
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cheerful (adj.)

c. 1400, "full of cheer, having good spirits," from cheer (n.) + -ful. Meaning "elevating the spirits" is from mid-15c. Related: Cheerfully; cheerfulness.

updated on November 06, 2017

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Definitions of cheerful from WordNet

cheerful (adj.)
being full of or promoting cheer; having or showing good spirits;
a cheerful greeting
as cheerful as anyone confined to a hospital bed could be
a cheerful room
her cheerful nature
cheerful (adj.)
pleasantly (even unrealistically) optimistic;
Synonyms: pollyannaish / upbeat
From wordnet.princeton.edu, not affiliated with etymonline.