Adjective disillusioning has 1 sense
  1. disenchanting, disillusioning - freeing from illusion or false belief
    Antonym: unconvincing (indirect, via convincing)
,Verb disillusion has 1 sense
  1. disenchant, disillusion - free from enchantment
    --1 is one way to disappoint, let down
    Derived forms: noun disillusionment1, noun disillusion1
    Sample sentence:
    The performance is likely to disillusion Sue
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