Webster's English Dictionary

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bad

1. bad \'bad\  archaic past of BID 
2. bad \'bad\ \'w*rs\ \'w*rst\ aj or worse;  or worst [ME] 1a: below 
   standard : POOR  1b: UNFAVORABLE {~ impression}  1c: DECAYED, SPOILED  2a: 
   morally evil  2b: MISCHIEVOUS, DISOBEDIENT  3: INADEQUATE {~ lighting}  4: 
   DISAGREEABLE, UNPLEASANT {~ news}  5a: INJURIOUS, HARMFUL  5b: SEVERE {~ 
   cold}  6: INCORRECT, FAULTY {~ grammar}  7: ILL, SICK {feel ~}  8: 
   SORROWFUL, SORRY  9: INVALID, VOID ply to anything or anyone reprehensible 
   for whatever reason and to whatever degree; EVIL is a stronger term than 
   BAD and usu. carries a baleful or sinister connotation; ILL is a less 
   emphatic synonym of EVIL and may imply malevolence or vice; WICKED implies 
   violation of moral law and connotes malice and malevolence; NAUGHTY applies 
   to trivial misbehavior chiefly of children - bad av SYN syn EVIL, ILL, 
   WICKED, NAUGHTY; BAD may ap 
3. bad n 1: something that is bad  2: an evil or unhappy state