IPA: /ˈjiːstɪli/
KK: /ˈjistɪli/
In a way that is lively or full of energy, similar to how yeast causes fermentation.
The party was yeastily filled with laughter and dancing.
Yeastily → The word is derived from "yeast" (from Old English *gist*, meaning a fermenting agent) and the suffix "-ily" (meaning in a manner). The term "yeastily" refers to something done in a manner characteristic of yeast, often implying liveliness or fermentation.
Think of 'yeast' as a fermenting agent that brings liveliness, and '-ily' means in a manner. So, 'yeastily' describes something done in a lively or fermentative way.