Synonym: neglect, negligence, nonperformance, sloppiness. Similar words: uselessness, selflessness, tactlessness, limitlessness, careless, carelessly, tireless, relentless. Meaning: ['kərləsnɪs /'keəl-] 
n. 1. the quality of not being careful or taking pains 2. failure to act with the prudence that a reasonable person would exercise under the same circumstances.
n. 1. the quality of not being careful or taking pains 2. failure to act with the prudence that a reasonable person would exercise under the same circumstances. 
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91. The realization of automatic edge matching by program can not only avoid the carelessness of manual working, but also find the edge matching errors which are difficult to find by manual working.
92. You will have to answer for your rush and carelessness.
93. Due to carelessness, his head hit the doorframe with a loud bang.
94. These mistakes are often the result of inattention and carelessness.
95. Many traffic accidents seem to be brought about by the misplay or carelessness of the driver.
96. However, Braga were undone by carelessness in possession and then a lapse in marking - Alberto Rodriguez gave the ball away and the defence failed to pick up Falcao, who finished with style.
97. You will always find his tardiness and carelessness in everything he does.
More similar words: uselessness, selflessness, tactlessness, limitlessness, careless, carelessly, tireless, relentless, callousness, arduousness, useless, righteousness, consciousness, fastidiousness, meticulousness, capriciousness, timeless, nonetheless, baseless, homeless, hopeless, pretentiousness, ceaseless, guileless, tasteless, senseless, blameless, priceless, shapeless, hopelessly.