mattoid
noun
rare a person displaying eccentric behaviour and mental characteristics that approach the psychotic
Word Origin for mattoid
C19: from Italian, from matto insane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for mattoid
Historical Examples of mattoid
I thought at first you were a mattoid, but you're so amazingly consistent.
The Wonderful VisitHerbert George Wells
These mattoid scientists make a direct and disastrous attack upon the latent self-respect of criminals.
Mankind in the MakingH. G. Wells