Definition of mystery-monger in US English:

mystery-monger

noun

derogatory
  • A person who makes mysteries out of things; a person who cultivates or encourages mystery or mystification.

Origin

Late 18th century; earliest use found in Thomas Nugent (c1700–1772), writer and traveller. From mystery + monger.

Pronunciation

mystery-monger

/ˈmɪst(ə)riˌmʌŋɡə/