adverb uk /ˈθɔːt.ləs.li/ us /ˈθɑːt.ləs.li/
noun [ U ] uk /ˈθɔːt.ləs.nəs/ us /ˈθɑːt.ləs.nəs/
(Definition of “thoughtless” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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a period of time during which an animal or person that might have a disease is kept away from other people or animals so that the disease cannot spread