exacerbescent,a.|ɛgˌzæsəˈbɛsənt| [ad. L. exacerbescent-em, pr.pple. of exacerbescĕre to become angry, f.ex-(see ex- prefix1) + acerb-us harsh, bitter.] Tending to become embittered. 1889H. F. Wood Englishman Rue Caïn xi. 155 That exacerbescent irritability had been partly assumed.