Acrimoniously

adv. [f. prec. + -LY².] In an acrimonious manner; with irritating bitterness or severity.

1829.  S. Turner, Mod. Hist. Eng., IV. II. xxvii. 173. Commencing and acrimoniously pursuing a personal and deadly warfare against the queen.

1866.  C. C. Felton, Greece, II. vii. 114. They often differed, sometimes acrimoniously.