careless

Careless is an adjective that describes a lack of attention, caution, or consideration in thought or action. It can refer to a momentary lapse or a broader pattern of behavior. The word is formed from the noun care with the suffix -less, meaning “without care.”

In everyday language, careless describes actions that fail to show proper precaution, such as a careless mistake at work, careless handling of machinery, or a careless remark that hurts someone. The adverb form is carelessly, and the related noun is carelessness. In safety, legal, or professional contexts, careless can carry a stronger implication of negligence or a breach of duty, though the intensity varies with tone and jurisdiction.

Common collocations include careless mistake, careless driving, careless handling, and being careless about something. Antonyms include careful, cautious, and meticulous. The term is often contrasted with carefulness, which connotes deliberate attention and efforts to prevent risk. While the word can be used descriptively to refer to everyday slips, in formal or critical contexts it may indicate fault or liability when care is expected or required.