yucky

adjective, yuck·i·er, yuck·i·est. Slang.

1. thoroughly unappetizing, disgusting, or repugnant.

adjective yuckier, yuckiest, yukkier or yukkiest

1. slang disgusting; sickening; nasty

adj.1970, from yuck (1) + -y (2). Related: Yuckiness.