Sketchy - Tradução em português

Urban Dictionary
1) someone or something that just isnt right. 2) the feeling you get the morning after usuing a lot of drugs, most commonly associated with extacy. 3) something unsafe 4) someone or something that gives off a bad feeling

i dunno, his story sounds kind of sketchy

i cant come in to work today, im sketchy

This is very current American slang. I usually hear it used to mean "unsafe, dangerous".
1) "The neighborhood is kind of sketchy."
2) "The restaurant looked rather sketchy."