IPA: /ˈɡlædɪst/
KK: /ɡlædɪst/
The most happy or pleased; feeling or showing joy.
She was the gladdest person at the party when she heard the good news.
Comparative: gladder
Superlative: gladdest
Gladdest is formed from "glad" (from Old English "glæd", meaning joyful or happy) and the suffix "-est" (indicating the superlative degree). The word "gladdest" means the most joyful or happy.
Think of the Old English word for joyful, 'glad', and remember that 'gladdest' means the most joyful.