IPA: /ˈdʒɔɪfəl/
KK: /ˈdʒɔɪfəl/
Feeling or showing great happiness and delight.
The children were joyful when they saw the colorful fireworks.
Comparative: more joyful
Superlative: most joyful
Joyful → It is formed from "joy" (from Old French *joie*, meaning happiness or delight) and "-ful" (meaning full of). The word "joyful" means full of joy or happiness.
Think of 'joy' as happiness and remember that 'joyful' means being full of happiness.