IPA: /ˈzæpiəst/
KK: /ˈzæpiɪst/
The most lively, energetic, or exciting; full of enthusiasm or spirit.
She was the zappiest person at the party, making everyone laugh and dance.
Comparative: zappier
Superlative: zappiest
'Zappy' is derived from the informal term 'zap', which is believed to originate from the sound associated with an electric shock or a quick movement, and '-iest' is a superlative suffix used to indicate the highest degree of a quality. Therefore, 'zappiest' refers to something that is the most lively, energetic, or exciting, akin to the quick and energetic connotation of 'zap'.
Think of the word 'zap' as representing energy or excitement, and remember that 'zappiest' means the most energetic or lively.