The quality or state of being cheerful, pleasant, and good-natured in temperament.
From 'good' (Germanic origin, meaning virtuous or positive) plus 'humor' (from Latin 'humorem', relating to mood and temperament) plus '-edness' (a suffix making it a noun). This compound emerged in English to describe stable cheerfulness.
In medieval times, doctors thought four 'humors' controlled your personality—if yours were balanced, you'd have 'good humor'! The term stuck around even after we learned that wasn't true!
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