Nastier Synonyms and Antonyms

So objectionable as to elicit despisal or deserve condemnation
(Adjective)
Injurious, dangerous
(Adjective)
Antonyms:
  1. safer
Having or showing a bad temper
(Adjective)
Offensive or even (of persons) malicious; ; ; ; ; ; - Ezra Pound
(Adjective)
Antonyms:
  1. nicer
  2. decenter
Heavily soiled; very dirty or unclean
(Adjective)
Antonyms:
  1. cleaner
  2. decenter