carelessness
Americannoun
-
failure to pay enough attention to what one is doing; sloppiness.
Unlike unavoidable error, a “mistake” in an experiment is something known to be incorrect due to accident, carelessness, or ineptitude.
-
lack of accuracy or thoroughness.
The many instances of carelessness in the book (with references, dates, etc.) detract from its value.
-
the fact or quality of being said or done thoughtlessly or negligently.
You were too quick to make promises you can’t possibly fulfill—which only shows the carelessness of your remarks.
-
lack of regard or concern for something (usually followed by of, about, for, ortoward ).
He was repulsed by their carelessness and cruelty toward those less fortunate.
Her rudeness and arrogance betray her carelessness for other people's feelings.
-
effortless or artless quality.
She is a highly intelligent academic who nevertheless speaks with the simplicity and carelessness of a child.
Other Word Forms
Etymology
Origin of carelessness
First recorded before 1000; careless ( def. ) + -ness ( def. )
Explanation
Acting without thinking things through is carelessness. Don't try to text a friend while you're riding your bike, or your carelessness may send you crashing into a mailbox. You can think of carelessness as negligence, a failure to pay close attention or carefully consider the possible ramifications of your actions. Driver carelessness causes many traffic accidents, and a writer's carelessness can result in grammatical errors and misspellings. The Old English version of this word, carleasnes, meant "freedom from anxiety," something closer to nonchalance than today's carelessness.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"It's massively frustrating when these kind of incidents occur, especially when it's caused by carelessness and us humans and these poor birds have suffered because of it," she said.
From BBC ● Nov. 1, 2026
Cardellini’s Pamela Voorhees is what happens when women drinking from a bottomless well of contempt and human carelessness hit their limit.
From Salon ● Oct. 18, 2026
Negligent parties should be held responsible when carelessness causes harm, and governments have legitimate roles in protecting critical infrastructure and national security.
From MarketWatch ● Sep. 22, 2026
None of this means an undesirable outcome with AI is necessarily the result of human carelessness.
From The Wall Street Journal ● Sep. 15, 2026
That’s how every act of carelessness begins and ends.
From "The Diary of a Young Girl" by Anne Frank
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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
