Careless

not paying enough attention to what one does:
a careless typist.
not exact, accurate, or thorough:
careless work.
done or said heedlessly or negligently; unconsidered:
a careless remark.
not caring or troubling; having no care or concern; unconcerned (usually followed by of, about, or in):
careless of the rights of others; careless about one’s behavior; careless in speech.
possessed or caused without effort or art; unstudied:
careless beauty.
Archaic. free from anxiety.
Contemporary Examples

If he cultivates a harem without taking responsibility for it, he is, however, careless.
How Not to Manage a Harem Tracy Quan December 7, 2009

Victims of careless ‘dox’ attempts say the consequences are miserable.
Web Sleuths Get It Wrong Again in Ferguson Tim Mak August 14, 2014

The cellphone records show a careless trail of negotiations between the men and the girls.
Mussolini Family Tied to Underage Sex Ring Barbie Latza Nadeau March 11, 2014

But in our society of intense scrutiny of physical appearance, my humiliation was not an abnormal outcome of his careless actions.
Your Puffy-Face Moments, Inspired by Ashley Judd April 12, 2012

They issued him a $164 ticket for careless driving, which he signed and paid during the meeting.
The Tiger Coverup Steve Helling May 2, 2010

Historical Examples

He is so careless and good-tempered that anything pleases him for the moment.
The Inglises Margaret Murray Robertson

But what troubled her most of all was that he should be so careless about the wrong he had done, whatever it was.
Weighed and Wanting George MacDonald

A careless groom might injure it in the hurry and excitement of the night.
Wenderholme Philip Gilbert Hamerton

“Let me know about it before you do it,” said Linda with a careless laugh.
Her Father’s Daughter Gene Stratton-Porter

“Wait till you have seen the arrangements, my liege,” said careless.
Boscobel: or, the royal oak William Harrison Ainsworth

adjective
done with or acting with insufficient attention; negligent
often foll by in, of, or about. unconcerned in attitude or action; heedless; indifferent (to): she’s very careless about her clothes
(usually prenominal) carefree
(usually prenominal) unstudied; artless: an impression of careless elegance
adj.

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).