[syn: madly, insanely, deadly, deucedly, devilishly]
The Collaborative International Dictionary of English v.0.48:
Insanely \In*sane"ly\, adv.
   Without reason; madly; foolishly.
   [1913 Webster]
WordNet (r) 3.0 (2006):
insanely
    adv 1: in an insane manner; "she behaved insanely"; "he behaves
           crazily when he is off his medication"; "the witch
           cackled madly"; "screaming dementedly" [syn: insanely,
           crazily, dementedly, madly] [ant: sanely]
    2: (used as intensives) extremely; "she was madly in love";
       "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely
       jealous" [syn: madly, insanely, deadly, deucedly,
       devilishly]