Carelessly

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

But the reporting, based on the same vague words, carelessly checked and sourced, remains unchanged.
Bernard-Henri Levy: Have I Become an Undesirable in Libya? Bernard-Henri Lévy March 26, 2013

According to Indian media reports, the Italians were accused of carelessly shooting like “cowboys at sea”.
Italian Pirate-Fighting Marines On Trial Barbie Latza Nadeau February 13, 2014

And you must retie binds with those you carelessly discarded.
Your Horoscopes: May 15-21 Starsky + Cox May 13, 2011

The acted-upon impulse to throw it all carelessly to the wind.
Men of a Certain Age and TV’s Midlife Crisis Nicole LaPorte January 4, 2011

Never has such a strong political hand been so needlessly, carelessly, calamitously thrown away.
Simon Schama on How Obama Threw It All Away in the Denver Debate Simon Schama October 4, 2012

Historical Examples

So he spun on, carelessly good-humored, as they climbed the wind-ing hill-path.
The Ward of King Canute Ottilie A. Liljencrantz

“And before we know who she is to be,” said Mrs. Beaumont, carelessly.
Tales And Novels, Volume 5 (of 10) Maria Edgeworth

Either the inscriptions are now defaced or I have carelessly omitted to note them.
The Stones of Venice, Volume II (of 3), John Ruskin

“A mistake; the fellow took me for some one he knew,” he told her carelessly.
The Black Bag Louis Joseph Vance

Her hair was carelessly arranged, and her bonnet awry–unerring indications of fathomless female misery.
Round the Block John Bell Bouton

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).