Pronunciation: (yē'stē), [key]
—adj., 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.