| bad | (adjective) having undesirable or negative qualities | - |
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| (adjective) feeling or expressing regret or sorrow or a sense of loss over something done or undone | Synonyms: regretful, sorry |
| (adjective) reproduced fraudulently | Synonyms: forged |
| (adjective) characterized by wickedness or immorality | - |
| (adjective) capable of harming | - |
| (adjective) below average in quality or performance | - |
| (adjective) serious or severe | Synonyms: big |
| (adjective) not capable of being collected | Synonyms: uncollectible |
| (adjective) not working properly | Synonyms: defective |
| (adjective) nonstandard | - |
| (adjective) (of foodstuffs) not in an edible or usable condition | Synonyms: spoiled, spoilt |
| (adjective) feeling physical discomfort or pain (`tough' is occasionally used colloquially for `bad') | Synonyms: tough |
| (adjective) physically unsound or diseased | Synonyms: unfit, unsound |
| (adjective) not financially safe or secure | Synonyms: high-risk, risky, speculative |
| (noun) that which is below standard or expectations as of ethics or decency | Synonyms: badness |
| (adverb) very much; strongly | Synonyms: badly |
| (adverb) with great intensity (`bad' is a nonstandard variant for `badly') | Synonyms: badly |
| badass | (adjective) being impressive due to extreme attitude or style | - |
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| (noun) A mean or belligerent person | - |
| (noun) A person considered impressive due to extreme attitudes, behavior or appearance | - |
| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| baddie | (noun) the principal bad character in a film or work of fiction | Synonyms: villain |
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| badge | (noun) any feature that is regarded as a sign of status (a particular power or quality or rank) | - |
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| (noun) an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.) | - |
| (verb) put a badge on | - |
| badger | (noun) sturdy carnivorous burrowing mammal with strong claws; widely distributed in the Northern Hemisphere | - |
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| (verb) persuade through constant efforts | - |
| (verb) annoy persistently | Synonyms: beleaguer, bug, pester, tease |
| badgerer | (noun) someone who tries to embarrass you with gibes and questions and objections | Synonyms: heckler |
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| badgering | (noun) the act of harassing someone | Synonyms: bedevilment, torment, worrying |
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| badinage | (noun) frivolous banter | - |
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| badlands | (noun) deeply eroded barren land | - |
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| badly | (adverb) (`ill' is often used as a combining form) in a poor or improper or unsatisfactory manner; not well | Synonyms: ill, poorly |
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| (adverb) to a severe or serious degree | Synonyms: gravely, seriously, severely |
| (adverb) very much; strongly | Synonyms: bad |
| (adverb) with great intensity (`bad' is a nonstandard variant for `badly') | Synonyms: bad |
| (adverb) in a disobedient or naughty way | Synonyms: mischievously, naughtily |
| (adverb) evilly or wickedly | - |
| (adverb) unfavorably or with disapproval | Synonyms: ill |
| (adverb) with unusual distress or resentment or regret or emotional display | - |
| (adverb) in a disadvantageous way; to someone's disadvantage | Synonyms: disadvantageously |
| (adverb) without skill or in a displeasing manner | - |
| badminton | (noun) a game played on a court with light long-handled rackets used to volley a shuttlecock over a net | - |
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| badmouth | (verb) speak unfavorably about | Synonyms: drag through the mud, malign, traduce |
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| badness | (noun) that which is below standard or expectations as of ethics or decency | Synonyms: bad |
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| (noun) used of the degree of something undesirable e.g. pain or weather | Synonyms: severeness, severity |
| (noun) an attribute of mischievous children | Synonyms: mischievousness, naughtiness |