Resembling or characteristic of a donkey, or stubborn like a donkey.
From 'donkey' + adjectival suffix '-y'. The word emerged in informal English to describe something with donkey-like qualities, either physically or behaviorally.
English loves adding '-y' to nouns to turn them into quick adjectives—doncy, silky, grassy—and it's a super efficient way kids naturally create new words by following this pattern.
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