Definify.com

Webster 1913 Edition

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Adj.

[Cf. F.

monomaniaque

Affected with monomania, or partial derangement of intellect; caused by, or resulting from, monomania;

as, a

monomaniacal

delusion

monomaniacal ‎(comparative more monomaniacal, superlative most monomaniacal)

Fanatical, or obsessed with one cause or idea to the exclusion of other concerns.
Of or relating to a monomaniac.