c.1300, from O.Fr. quiete, from L. quies (gen. quietis) "rest, quiet," from PIE base *qwi- "rest" (cf. Goth. hveila, O.E. hwil "space of time;" see while). The adj. is attested from 1382; the verb is first attested 1440. Quietism is attested from 1687, on model of mysticism, originally in ref. to the mysticism of Molinas (1640-97), Sp. priest in Rome, whose "Guida spirituale" was published 1675 and condemned by the Inquisition in 1685. Quietude is from 1597.