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Definition of carelessness : The quality or state of being careless; heedlessness; negligenece; inattention.

Synonyms:

mushiness, indolence, disuse, scorn, remissness, nonperformance, muddiness, drippiness, wateriness, default, soupiness, sentimentality, slight, disrespect, careful, procrastination, unkemptness, abandon, slackness, mawkishness, failure, delinquency, omission

brashness, rashness, desperation, imprudence, foolhardiness, hotheadedness, recklessness, incautiousness, impetuousness, injudiciousness, audacity, brazenness, daringness

arbitrariness, spasticity, fleetingness, volatility, whimsicality, ambivalence, caprice, indecisiveness, randomness, waywardness, impulsiveness, flightiness, irregularity, fancifulness, fickleness, haphazardness

nonchalance

messiness, dirtiness, shabbiness

dispassionateness, disinterest, insouciance, incuriousness

inconsiderateness, sloppiness, clumsiness, neglect, neglectfulness, inadvertency, slovenliness, inattentiveness, shoddiness, perfunctoriness, senility, dereliction

apathy, befuddlement, lack of interest, disregardfulness, disregard, dreaminess, absent-mindedness, heedlessness, inadvertence, obliviousness, unconsciousness, inattention, disinterestedness, negligence, incuriosity, distraction, thoughtlessness, detachment, indifference, lapse, oversight, preoccupation, unconcern, inobservance, absence, forgetfulness, aloofness

Usage examples:

• Whereupon the beggar drew his bow with seeming carelessness and split the wand with his shaft. - "Robin Hood", J. Walker McSpadden.
• The Prussian passed for a very virtuous court in comparison with the other courts of Germany; but the tone towards women, and the carelessness with which the most doubtful connexions were treated, were there also very great. - "Pictures of German Life in the XVIIIth and XIXth Centuries, Vol. II.", Gustav Freytag.
• To Stainton's ear the use of one's first Latin verb translated was not merely schoolgirl carelessness and want of variety of phrase; it was an accurate expression of her abounding capacity for intense affection, her splendid fortune of emotion and her equally splendid generosity in its disposal. - "Running Sands", Reginald Wright Kauffman.