Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
επιτηδεύσεισ will you LXX.Jer.2.33
επετήδευσεν applied LXX.Mal.2.11

Liddell-Scott-Jones

ἐπιτηδεύω (epitēdeuō) to apply G:V

ἐπιτηδεύω-εύω,

imperfect ἐπετήδευον [Refs 5th c.BC+]: aorist ἐπετήδευσα [Refs 5th c.BC+]perfect ἐπιτετήδευκα, passive -ευμαι, [ἐπιτηδεύωές)">Refs 5th c.BC+]:—pursue or practise a thing, make it one's business, c.accusative, εὐπαθείας [Refs 5th c.BC+]; τέχνην, μουσικήν, [Refs 5th c.BC+]; . τι πρός τι invent with a view to.., [Refs 5th c.BC+]:—passive, to be practised, ὅσα κακὰ καὶ αἰσχρά τινι ἐπιτετήδευται [Refs 5th c.BC+]; also, to be made so and so by art, opposed to to being so by nature, [Refs 5th c.BC+]; of dogs, to be carefully trained, πρός τι [Refs 5th c.BC+]

__2 with infinitive. take care to do, use to do, [Refs 5th c.BC+]
__3 absolutely in participle, οὐδὲν αὐτοὶ ἐπιτηδεύωεύοντες without any deliberate purpose on our part, [ἐπιτηδεύωεύσας ">Refs 4th c.BC+]on purpose, [Refs 3rd c.AD+]