πλημμελεῖν
From LSJ
Μή μοι γένοιθ', ἃ βούλομ', ἀλλ' ἃ συμφέρει → Ne sit mihi, quod cupio, sed quod expedit → nicht was ich will, geschehe mir, doch was mir nützt
Greek > English (Woodhouse Verbs Reversed)
(see also πλημμελέω): misbehave, sin, be at fault, cause offence, do wrong, misconduct oneself, strike a jarring note