Merriam-Webster's Collegiate® Dictionary, 11th Edition
BAD
I. adjective (worse; worst)
Etymology: Middle English
Date: 14th century
1. failing to reach an acceptable standard ; poor , unfavorable , not fresh ; spoiled , not sound ; dilapidated ,
2. morally objectionable ; evil , mischievous , disobedient , inadequate or unsuited to a purpose , disagreeable , unpleasant ,
5. injurious , harmful , serious , severe , incorrect , faulty ,
7. suffering pain or distress , unhealthy , diseased , sorrowful , sorry ,
9. invalid , void , not able to be collected , 1
0. badder baddest slang good , great , tough , mean , badness noun
II. noun
Date: 15th century
something that is bad, an evil or unhappy state,
III. adverb
Date: 1681
badly