Treating with contempt; refusing to acknowledge or accept as worthy; the present participle form of disdain.
From disdain + -ing (present participle suffix). This creates both the verb form (he is disdaining) and the adjective form (a disdaining look).
The gerund 'disdaining' is often used in older texts to mean rejecting marriage proposals or social positions—think of Victorian novels where wealthy women are described as 'disdaining' unsuitable suitors.
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