say it: NA-stee-nuhs
nastiness is a noun meaning "a state characterized by foul or disgusting dirt and refuse". It carries 3 recorded senses.
a state characterized by foul or disgusting dirt and refuse
malevolence by virtue of being malicious or spiteful or nasty
the quality of being highly unpleasant
“I flinched at the nastiness of his wound”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for nastiness come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.