IPA: /ˈtʃætiəst/
KK: /ˈtʃæt̬iɪst/
This word describes someone who talks a lot or is very talkative, more than anyone else.
She is the chattiest person in our group, always sharing stories and jokes.
Comparative: chattier
Superlative: chattiest
Chattiest → It is formed from "chat" (from Old French *chater*, meaning to talk or chatter) and the suffix "-iest" (meaning most). The word "chattiest" means the most talkative or the one who chats the most.
Think of 'chat' as talking a lot, and the '-iest' means the most. So, when someone is the 'chattiest', they are the one who talks the most.