mindful (adj.)youdaoicibaDictYouDict[mindful 词源字典]
mid-14c., from mind (n.) + -ful. Related: Mindfully; mindfulness. Old English myndful meant "of good memory." Old English also had myndig (adj.) "mindful, recollecting; thoughtful," which if it had lived might have yielded a modern *mindy.[mindful etymology, mindful origin, 英语词源]