Full of cheer; happy, optimistic, and willing to help others feel good.
From Old French 'chiere' (face, countenance) + '-ful' (full of). The root meaning evolved from 'having a good face' to 'having a cheerful demeanor' by medieval times.
The word 'cheer' originally meant the expression on someone's face—so calling someone 'cheerful' literally meant their face showed joy. Medieval people understood emotions through facial expressions in a way we still use today.
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