sketchy
Of dubious safety or legal integrity. He's assuring me that the scheme is totally legitimate, but it sounds pretty sketchy to me. He jerry-rigged some sketchy makeshift scaffolding so we could finish the painting on the outside wall, and I spent the whole time worried it would come toppling down around us.
sketchy
mod. unsafe; illegal; risky. (Alluding to danger due to lack of knowledge.) Why are we going down in the sketchy place on this silly errand?