Informal descriptor for something cousin-like, familiar, or characteristic of the casual warmth typical of cousin relationships.
From 'cousin' + '-y' (informal adjective suffix), creating a colloquial, playful adjective similar to 'courty', used informally rather than in formal speech.
'Cousiny' is English's way of creating informal adjectives—just as we say 'it feels very family-y,' speakers naturally add '-y' to nouns to express informal resemblance.
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