nasty
UK[ˈnɑːsti]US[ˈnæsti]
adj
very bad or unpleasant
adj
unkind or offensive
adj
dangerous or serious
Etymology
the word 'nasty' first appeared in late middle english, but its ultimate origin is obscure and debated. one plausible theory connects it to an old dutch word 'nestig', meaning 'dirty', which itself may be related to 'nest', evoking the idea of filth. another suggestion links it to the old french 'nastre', meaning 'bad, strange', possibly from latin 'nasturcium' (watercress), noted for its pungent taste. despite its unclear beginnings, the word evolved in english to broadly describe anything foul, disagreeable, or offensive, solidifying its modern meanings.
Analysis
the word is considered a simplex form. its exact origin is uncertain, but it is likely from a dialectal source.
Examples
there's a nasty smell coming from the drain.
that was a nasty thing to say.
he had a nasty fall and broke his wrist.