Marked by or showing condescension; reluctantly willing to do something beneath one's perceived status.
From 'deign' plus the suffix '-ous' (full of, characterized by). This archaic or rare adjective formation describes the attitude or manner of someone who deigns.
This word is nearly obsolete, but it's the perfect adjective for those rare moments when you need to describe someone's entire condescending attitude with one dismissive term.
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