needful (adj.)
late 12c., niedfulle, "needy," from need (n.) + -ful. Meaning "characterized by need" is from mid-13c.; meaning "indispensable" is from mid-14c.; noun meaning "what is necessary" is from 1709. Colloquial sense of "cash" is recorded from 1774 in phrase the needful "money." Related: Needfully.