nasty

adjective

1. 1

   disgustingly dirty; filled or smeared with offensive matter

   as filthy as a pigsty

   a foul pond

2. 2

   characterized by obscenity

   had a filthy mouth

   foul language

3. 3

   exasperatingly difficult to handle or circumvent

   a nasty problem

   a good man to have on your side in a tight situation

4. 4

   offensive or even (of persons) malicious

   in a nasty mood

   a nasty accident