Lively, energetic, and full of enthusiasm or cheerfulness.
From 'pep' (shortened form of 'pepper' or possibly from 'peptic'), combined with '-y.' The word 'pep' became popular in early 1900s American slang to mean energy or vigor, similar to how pepper adds zing to food.
Peppy and pepper share more than a name—peppers actually contain capsaicin, which triggers the same nerves that create feelings of energy and alertness, so there's a real chemical link between the spice and the personality trait!
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