questionable
Whenever a question is able to be formed about a certain idea, principle, or physical thing, and there is concern about its validity, the idea, principle, or physical thing has become questionable.
"Kevin, did you see that girl? She's so freaking hot!"

"Yeah, dude, would you tap that?"

"I don't know man, I heard the entire football team did..so that's a pretty questionable vajayjay."