Superlative form of chatty; the most inclined to chat, the most talkative or gossipy.
From chatty + -est (superlative suffix). The 'y' changes to 'i' before the superlative suffix, following the same spelling rules as comparative forms.
Superlative forms like 'chattiest' are actually quite efficient—instead of saying 'more chatty than anyone else,' one word captures the whole meaning, which is why superlatives are so common in daily speech!
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