κακοτροπέω
From LSJ
ἵνα οὖν μηδ' ἐν τούτῳ δῷ αὐτοῖς λαβήν (Photius, Fragments on the Epistle to the Romans 483.26) → so that he doesn't give them even here a handle (= an opportunity for refutation)
English (LSJ)
A become malignant, of ulcers, Hp.Mul.1.38.
German (Pape)
[Seite 1304] von schlechtem Charakter sein, tückisch handeln, Hippocr.
Greek (Liddell-Scott)
κακοτροπέω: φέρομαι κακοτρόπως, δυστροπῶ, ἐθελοκακῶ, Ἱππ. 606. 31.