ἀντιχαλεπαίνω
From LSJ
τραχὺς ἐντεῦθεν μελάμπυγός τε τοῖς ἐχθροῖς ἅπασιν → he is a tough black-arse towards his enemies, he is a veritable Heracles towards his enemies
English (LSJ)
A to be embittered against, D.H.17.5, Plu.2.468b.
Greek (Liddell-Scott)
ἀντιχᾰλεπαίνω: χαλεπαίνω κατὰ χαλεπήναντος, Διον. Ἁλ. Ἐκλογαὶ τ. 4, σ. 2335, 17, ἔκδ. Reisk., Πλούτ. 2. 468Β.