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English definition of “bad”

bad

adjective (LOW QUALITY)    /bæd/ (worse, worst)
A2 of low quality, or not acceptable: The plumber did a bad job on the repairs. Are the company's current difficulties a result of bad (= harmful) luck or bad (= of low quality) judgment? He has some very bad habits. In some parts of the world, it is considered bad manners to pick up food or cutlery with the left hand. He was sent home from school for bad behaviour. That remark was in (rather) bad taste, wasn't it? I'm very bad at cooking (= cannot do it very well).Not of good qualityRubbish and wasteInformal words for bad Grammar:Good at, bad atWe use adjective + at to talk about things that we do well or badly:See more badness     /ˈbæd.nəs/ noun [U] the quality of being evil or morally unacceptable: There is goodness and badness in everyone.Morally wrong and evilDishonest
(Definition of bad adjective (LOW QUALITY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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