demoralizer

Verb

demoralize (third-person singular simple present demoralizes, present participle demoralizing, simple past and past participle demoralized)

1. (British, English, Oxford, US, transitive) To destroy the morale of; to dishearten.

   Synonyms:

   daunt, deter, discourage

   Antonyms:

   encourage, hearten

2. (British, English, Oxford, US, dated, transitive) To erode the moral adherence of; to corrupt.
   • [I]f you convert a man brought up in another creed, you inevitably demoralize him.1915 December (date written), [George] Bernard Shaw, “Androcles and the Lion. Preface on the Prospects of Christianity.”, in Androcles and the Lion, Overruled, Pygmalion, London: Constable and...

   Synonyms:

   immoralize, unmoralize, warp, adulterate, corrupt, debauch, detort, file, lead astray, pervert