In a manner characterized by dereism; in a way that reflects disconnection from reality, fantasy, or loss of contact with external circumstances.
From 'dereistic' plus the suffix '-ly' (in the manner of), forming an adverb rarely used in modern contexts since dereism terminology has largely been replaced in contemporary psychiatry.
This word is fascinating because it reveals how psychiatric terminology evolves—'dereistically' was once common, but modern psychology found better, less stigmatizing ways to describe what's actually happening in these conditions.
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