murky

1. ADJ

A murky place or time of day is dark and rather unpleasant because there is not enough light.     

• The large lamplit room was murky with woodsmoke.
  

4. ADJ

If you describe something as murky, you mean that the details of it are not clear or that it is difficult to understand.     

• The law here is a little bit murky.     
• = obscure   

.... Cobuild