A mistake you make because you aren't really paying attention is an example of a careless mistake.
A careless remark.
Danced with careless grace.
A careless grin; a careless wave of the hand.
A careless grace.
Jessica was so careless that she put her shorts on backwards.
A careless housekeeper; careless proofreading.
A careless mistake.
Careless of the consequences.
- Indifferent to; untroubled by.
Idioms and Phrasal Verbs
Origin of careless
- From Middle English careles, from Old English carlēas (“careless, reckless, void of care, free from care, free”), equivalent to care + -less.