Definition of againstism in English:

againstism

noun

US
informal
  • The position or practice of being opposed to something, or of having an oppositional attitude in general; (habitual) opposition or criticism.

Origin

1940s. From against + -ism. Compare earlier againstness, againster.

Pronunciation:

againstism

/əˈɡɛnstɪz(ə)m//əˈɡeɪnstɪz(ə)m/