yeasty

comparative yeastier · superlative yeastiest

1. Having or resembling yeast.
2. Foamy and frothy.

   The Ocean when its yeasty war is waging / Is awful to the vessel near the rock [...].

   1821 August 8, [Lord Byron], Don Juan, Cantos III, IV, and V, London: […] Thomas Davison, […], →OCLC, canto III, stanza 58

3. Emotionally bubbling over (as with exuberance)
4. Trivial.

   Thus has he, and many more of the same breed that I know the drossy age dotes on, only got the tune of the time and, out of an habit of encounter, a kind of yeasty collection, which carries them through and through the most profane and winnowed opinions

   c. 1599–1602 (date written), William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene ii]