physically filthy; disgustingly unclean

a nasty pigsty of a room.

offensive to taste or smell; nauseating.

offensive; objectionable

a nasty habit.

vicious, spiteful, or ugly

a nasty dog; a nasty rumor.

bad or hard to deal with, encounter, undergo, etc.; dangerous; serious

a nasty cut; a nasty accident.

very unpleasant or disagreeable

nasty weather.

morally filthy; obscene; indecent

a nasty word.

Slang . formidable

The young pitcher has a good fast ball and a nasty curve.

Informal . a nasty person or thing.

adjective

great , magnificent , pleasing , wonderful , clean , decent , moral , agreeable , friendly , happy , kind , pleasant , aiding , assisting , helpful , helping , safe

adjective

awful , beastly , bum * , dirty , disagreeable , fierce , filthy , foul , gross , grubby , hellish , horrible , horrid , icky * , impure , loathsome , lousy , malodorous , mephitic , murderous * , nauseating , noisome , noxious , objectionable , obnoxious , obscene , odious , ornery , outrageous , poison , polluted , raunchy * , repellent , repugnant , repulsive , revolting , rough , sickening , soiled , squalid , stinking , tough , unappetizing , unclean , uncleanly , ungodly , unholy , unpleasant , vile , vulgar , yucky * , blue * , coarse , immodest , immoral , improper , indecorous , indelicate , lascivious , lewd , licentious , pornographic , ribald , scatological , shameful , unseemly , wicked , x-rated * , abusive , annoying , critical , cruel , despicable , distasteful , evil , hateful , malevolent , malicious , malign , malignant , ruthless , sarcastic , sordid , spiteful , unkind , vicious , bad , damaging , harmful , painful , poisonous , serious , severe , ugly , atrocious , disgusting , unwholesome , barnyard , bawdy , broad , fescennine , profane , scatologic , scurrilous , smutty , black , despiteful , mean , venomous , bad-tempered , cantankerous , crabbed , cranky , cross , fretful , grouchy , grumpy , irascible , irritable , peevish , petulant , querulous , snappish , snappy , surly , testy , waspish , abhorrent , abominable , antipathetic , contemptible , despisable , detestable , infamous , low , nefarious , rotten , shabby , wretched , indecent , nauseous , offensive , raunchy , shameless