Definition of misinformant in English:

misinformant

Pronunciation /ˌmɪsɪnˈfɔːm(ə)nt/

noun

rare
  • A person who gives wrong or misleading information.

Origin

Mid 19th century; earliest use found in Joseph Worcester (1784–1865), lexicographer and author. From mis- + informant, after misinform.