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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


in a monomaniacal manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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.
On the other side, the austerity-enabling Lib Dems hoovered up the votes of nominally "Labour" idiots monomaniacally obsessed with remaining in the EU.
Having said it, he repeats it monomaniacally, in every tone and inflection possible, interrupted only by intermissions of tears, exhausted sleep, or desperate cries.
The Trump administration has become monomaniacally focused on Iran.
Clemenceau was a lifelong nationalist, monomaniacally dedicated to the pursuit of French interests, whereas Lloyd George was the opposite, and thus too pliable and unprincipled for the task at hand.
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.