ἄκων ποιεῖν τι
From LSJ
ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται → for extreme diseases, extreme methods of cure, as to restriction, are most suitable (Corpus Hippocraticum, Aphorisms 1.6.2)
Greek > English (Woodhouse)
be loath to do a thing, do a thing intentionally, do a thing reluctantly, do a thing involuntarily