Synonyms for Stew (same or very similar meaning)
WordNet sense 1 (agitation resulting from active worry):
fret, lather, sweat, swither, latherWordNet sense 2 (be in a huff; be silent or sullen):
brood, grizzleWordNet sense 3 (bear a grudge; harbor ill feelings):
grudgeFrom the ODE community, based on WordNetadd/edit