Comfortable and cozy; informal slang for something that feels good and relaxing.
Shortened colloquial form of 'comfortable,' which comes from Old French 'confort' meaning to strengthen or console. The '-y' ending is a common English way to turn words into casual adjectives.
The word 'comfy' is basically informal English declaring that 'comfortable' is too many syllables—it's an example of how spoken language is lazy and efficient, always shortening words and adding '-y' to speed things up!
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