IPA: /ˈɡliːfəl/
KK: /ɡlifəl/
Feeling or showing great happiness and joy.
The children were gleeful as they played in the park.
Comparative: more gleeful
Superlative: most gleeful
Gleeful → It is formed from "glee" (from Old English *glēo*, meaning joy or mirth) and "-ful" (meaning full of). The word "gleeful" means full of joy or happiness.
Think of 'glee' as joy, and remember that 'gleeful' means being full of joy.