dementedly

In insane fashion

Dementedly means in a crazed, frenzied, or wildly irrational manner: She laughed dementedly as the plan fell apart, He was dementedly obsessed with winning.

The word suggests behavior so extreme it borders on madness, though it's often used hyperbolically rather than clinically.

madness

insanely

To an extreme degree

psychotically · deliriously · lunatically · unhinged · deranged · berserk · hysterically · irrationally · obsessively · fanatically

frenzy

frantically

In desperate haste

hysterically · turbulently · tempestuously · riotously · tumultuously · agitated · thrashing · flailing · rampaging · storming

obsession

compulsively

Driven by irresistible urge

doggedly · monomaniacally · consumed · driven · possessed · zealously · fervently · intensely · unwaveringly · persistently

Opposites
mental state/sanity

dementedlysanely

With mental soundness

lucidly · coherently · soberly · rationally · soundly

emotional composure

dementedlycalmly

In a tranquil manner

composedly · serenely · placidly · tranquilly · coolly

reasonableness of action

dementedlyreasonably

To a sensible degree

sensibly · rationally · logically · judiciously · prudently

Family

demented

Familiarity
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Used worldwide · Timeless · Abstract · Negative · Everyday, not technical · Rated PG