yeasty

adjective, yeast·i·er, yeast·i·est.

1. of, containing, or resembling yeast.
2. frothy; foamy.
3. youthful; exuberant; ebullient.
4. trifling; frivolous.
5. characterized by agitation, excitement, change, etc.: the yeasty years immediately following college.

adjective yeastier or yeastiest

1. of, resembling, or containing yeast
2. fermenting or causing fermentation
3. tasting of or like yeast
4. insubstantial or frivolous
5. restless, agitated, or unsettled
6. covered with or containing froth or foam

adj.1590s, from yeast + -y (2).