IPA: /ˈpɛpɪnəs/
KK: /ˈpɛpɪnəs/
The state of being lively, cheerful, and full of energy.
Her peppiness made the party much more enjoyable for everyone.
Peppiness is derived from "pep" (from the Latin word "piper", meaning pepper) and the suffix "-iness" (meaning the quality of). The word refers to the quality of being lively or spirited, akin to the stimulating effect of pepper.
Think of 'pep' as a burst of energy, and remember that 'peppiness' means the quality of being lively and spirited.
No commonly confused words.