YEASTY Meaning of YEASTY in English [yeasty] adj yeast.i.er ; -est (1598) 1: of, relating to, or resembling yeast 2. a: immature, unsettled b: marked by change c: full of vitality d: frivolous 1a, 2. -- yeast.i.ness n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012