Relating to or causing disillusionment; tending to destroy false hopes or beliefs.
From disillusion + -ary (forming adjectives). This combines the root 'disillusio' (removing illusion) with a suffix meaning 'of or relating to,' creating an adjective describing the character or nature of disillusionment.
This word sits at an interesting crossroads—'disillusionary' appears occasionally in older texts and academic writing, but modern English speakers prefer 'disillusioning,' showing how our language naturally gravitates toward simpler, more intuitive word formations over time.
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