unfit  
adjective uk/ʌnˈfɪt/ us/ʌnˈfɪt/
  (NOT GOOD ENOUGH)      
 B2 不适合的,不恰当的
not suitable or good enough for a particular purpose or activity
  The building was declared unfit for human habitation. 这座大楼被宣布不适合居住。 
   (NOT HEALTHY)      
B1 mainly UK不健康的 
not healthy because you do too little exercise
  I used to take plenty of exercise, but now I'm terribly unfit. 我过去经常进行大量锻炼,但现在我的身体状况非常糟糕。 
 - More examples
 - I felt so unfit after Christmas that I decided to join a gym.
 - The meat was clearly unfit for human consumption .
 - Simon is so unfit - he gets breathless just from walking up a flight of stairs.
 - They accused the government of being unfit to govern.
 - The judge ruled her an unfit mother.