Sacrilegious means extremely disrespectful towards something considered sacred. An action that causes deep offense to a believer — like burning a religious text, for example — is sacrilegious.

The Latin sacrilegus, "thief of sacred things," was used to describe robbers who plundered graves and temples. Anything that's sacrilegious is essentially as disrespectful as a graverobber towards things that others find holy or solemn and serious. In modern ironic usage, a sacrilegious opinion runs contrary to popular wisdom or deeply held beliefs. Calling the movie Citizen Kane boring and self-indulgent is totally sacrilegious to many movie lovers.

Definitions of sacrilegious
  1. adjective
    grossly irreverent toward what is held to be sacred
    “it is sacrilegious to enter with shoes on”
    synonyms: blasphemous, profane
    showing lack of due respect or veneration
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