Etymology
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sacrilegious (adj.)

mid-15c., sacrilegiose, "committing sacrilege, guilty of sacrilege," from Latin sacrilegiosum, from sacrilegium (see sacrilege). The sense of "profane, impious, involving sacrilege" is by 1620s. Earlier as a noun, "one who commits a sacrilege" (early 14c.). Related: Sacrilegiously; sacrilegiousness.

updated on November 03, 2021

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Definitions of sacrilegious from WordNet

sacrilegious (adj.)
grossly irreverent toward what is held to be sacred;
it is sacrilegious to enter with shoes on
Synonyms: blasphemous / profane
From wordnet.princeton.edu, not affiliated with etymonline.