Inclined to engage in casual conversation; talkative in a light, gossipy, or informal way.
From chitchat plus the adjective suffix -y, meaning 'characterized by' or 'full of' chitchat. This follows standard English adjectival formation patterns.
Creating adjectives with -y is one of English's most productive word-making tools, and 'chitchatty' shows how even made-up reduplicative words can instantly grow an adjective form that people understand without ever hearing before!
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