mid-14c., "having knowledge, remembrance, or recognition;" late 14c., "taking thought or care, heedful," from mind (n.) + -ful. Related: Mindfully. Old English myndful meant "of good memory." Old English also had myndig (adj.) "mindful, recollecting; thoughtful" (Middle English myndy), which if it had lived might have yielded a modern *mindy.
