INSANELY
madly, insanely, deadly, deucedly, devilishly
(adverb) (used as intensives) extremely; “she was madly in love”; “deadly dull”; “deadly earnest”; “deucedly clever”; “insanely jealous”
insanely, crazily, dementedly, madly
(adverb) in an insane manner; “she behaved insanely”; “he behaves crazily when he is off his medication”; “the witch cackled madly”; “screaming dementedly”
Source: WordNet® 3.1
Etymology
Adverb
insanely (comparative more insanely, superlative most insanely)
In an insane manner; not sanely.
To a great degree; very much.
Source: Wiktionary
In*sane"ly, adv.
Definition: Without reason; madly; foolishly.
INSANE
In*sane", a. Etym: [L. insanus. See In- not, and Sane.]
1. Exhibiting unsoundness or disorded of mind; not sane; mad;
deranged in mind; delirious; distracted. See Insanity, 2.
2. Used by, or appropriated to, insane persons; as, an insane
hospital.
3. Causing insanity or madness. [R.]
Or have we eaten on the insaneroot That takes the reason prisoner
Shak.
4. Characterized by insanity or the utmost folly; chimerical;
unpractical; as, an insane plan, attempt, etc.
I know not which was the insane measure. Southey.
Source: Webster’s Unabridged Dictionary 1913 Edition