- careless (adj.)
[careless 词源字典]
- Old English carleas "free from anxiety; unconcerned," from care (n.) + -less; a compound probably from Proto-Germanic. Original senses extinct by mid-17c.; main modern meaning "not paying attention, inattentive, not taking due care" is first recorded 1560s (in carelessly).[careless etymology, careless origin, 英语词源]