Cacodoxy

Part of speech: noun

Definitions

1. A system of beliefs or principles that are fundamentally wrong, false, or morally corrupt
2. A doctrine or system of beliefs that is fundamentally unsound, incorrect, or ethically corrupt
3. A false or morally depraved set of principles and teachings that are regarded as wholly mistaken

Etymology: Cacodoxy is a compound built from Greek parts: "kakos" meaning "bad" and "doxa" meaning "opinion, belief," with the "-y" ending that turns a quality or condition into a noun. Its Greek source, "kakodoxia," meant holding a bad or mistaken opinion, so the word's core sense has always been about belief rather than action. English took the term directly from Greek, and it sits in the same family as "orthodoxy" (right belief), which uses the same "doxa" root with "orthos" meaning "straight" or "correct." The pairing with "orthodoxy" is the key to the word's logic. Where orthodoxy names a set of approved beliefs, cacodoxy names the opposite: a body of ideas judged to be wrong at their foundations. The term is a deliberate contrast built from a familiar model, so its meaning follows directly from its parts without needing any separate history of usage.