shady  
adjective uk/ˈʃeɪ.di/ us/ˈʃeɪ.di/
  (SLIGHT DARKNESS)      
  阴凉的;背阴的
sheltered from direct light from the sun
  We sat on the shady grass for our picnic. 我们坐在阴凉的草地上野餐。 
   (DISHONEST)      
 informal不老实的;不正当的;非法的 
dishonest or illegal
  They know some very shady characters. 他们认识一些行为非常可疑的人物。 
 He was involved in shady deals in the past. 过去他参与了一些不可告人的勾当。