The quality or state of being deceptive or misleading.
From 'delusiv(e)' (adjective) plus '-ness' (noun suffix forming abstract nouns). Traces back to Latin 'deludere' via Middle English and Old French 'delusif.'
English speakers love turning adjectives into abstract nouns with '-ness'—it lets us talk about qualities themselves as things. 'Delusiveness' lets you discuss the very nature of trickery as a concept.
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