Profitable

google

ref

Middle English: from Old French, from the verb profiter (see profit).

wiktionary

ref

Old French profitable.

etymonline

ref

profitable (adj.)

c. 1300, "yielding spiritual or moral benefit, useful," from profit (v.) + -able or from Old French profitable, porfitable. From mid-14c. as "advantageous, expedient, helpful." Specific sense of "money-making" is attested from 1758. Related: Profitably; profitableness.