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 (mŏn′ə-mā′nē-ə, -mān′yə)
1. Pathological obsession with one idea or subject.
2. Intent concentration on or exaggerated enthusiasm for a single subject or idea.

mon′o·ma′ni·ac′ (-mā′nē-ăk′) n.
mon′o·ma·ni′a·cal (-mə-nī′ə-kəl) adj.
mon′o·ma·ni′a·cal·ly adv.


in a monomaniacal manner
References in classic literature ?
There was no shadow of Mr Merdle's complaint on the bosom now displaying precious stones in rivalry with many similar superb jewel-stands; there was no shadow of Mr Merdle's complaint on young Sparkler hovering about the rooms, monomaniacally seeking any sufficiently ineligible young lady with no nonsense about her; there was no shadow of Mr Merdle's complaint on the Barnacles and Stiltstalkings, of whom whole colonies were present; or on any of the company.
Whereas the sea dragon's heart in Basile's "La cerva fatata" is obtained by fishermen to whom there is no reason to believe any harm has come, Garrone has the king himself, desperate to please his melancholy-because-childless wife, hunt down the fearsome sea creature that kills him in the process, with the queen, monomaniacally looking for the dragon's heart on the shore, not giving her husband's corpse anything more than a quick glance.
And that good people of all sorts sometimes take their virtues to the extreme of vice, exhibiting "admirable immorality," as Michael Slote has termed it, by monomaniacally pursuing a virtue in a way that proves unfortunate.
In the twilight struggle over environmental policy, combatants on either side often become almost monomaniacally obsessed with the affiliation and presumed evil intent of their opponents.
He found the perfect location for his most ambitious Skyspace--an extinct volcano in Arizona that he has repurposed like a Bond villain monomaniacally obsessed with spectacle--by searching the terrestrial landscape for seven months from his small plane aloft in the skies of California and Arizona.