Lewis Short
(adjective) : stŏmăchōsus, a, um, stomachus, II.
* Wrathful, angry, irritable, ill-humored, peevish, pettish, choleric (rare but class.; syn. iracundus): eques,Hor. Ep. 1, 15, 12: stomachosa et quasi submorosa ridicula,Cic. de Or. 2, 69, 279: genus acuminis saepe stomachosum,id. Brut. 67, 236: genus irarum,Sen. Ira, 1, 4, 2.—Comp.: stomachosiores litteras meas, quas dicas esse, non intellego,Cic. Fam. 3, 11, 5.—* Adv.: stŏmăchōsē, angrily, peevishly; comp.: rescripsi ei stomachosius,Cic. Att. 10, 5, 3 (cf. id. ib. 10, 11, 5: θυμικώτερον eram jocatus, id. ap. Charis. 193 P.).
Charlton T. Lewis, Charles Short, A Latin Dictionary