IPA: //ˈnæstiər//
KK: /ˈnæstiər/
More unpleasant, offensive, or disgusting than something else.
The weather today is nastier than it was yesterday.
Comparative: nastier
Superlative: nastiest
Nastier → It is formed from "nasty" (from Middle English *nasti*, meaning unpleasant or offensive) and the comparative suffix "-er" (meaning more). The word "nastier" means more unpleasant or offensive than something else.
Think of the word 'nasty' to remember that 'nastier' means more unpleasant or offensive.