IPA: /ˈtʃɪəriəst/
KK: /ˈtʃɪr.i.ɪst/
The most happy and positive in mood or attitude.
She was the cheeriest person at the party, always smiling and making others laugh.
Comparative: cheerier
Superlative: cheeriest
Cheeriest → It is formed from "cheer" (from Old English *cēar*, meaning joy or gladness) and the suffix "-iest" (meaning most). The word "cheeriest" means the most joyful or glad.
Think of the Old English word for joy, 'cēar', to remember that 'cheeriest' describes someone who is the most joyful.