Wordnet 3.0
ADVERB (1)
1. 
 in an insane manner; 
- Example: "she behaved insanely"- Example: "he behaves crazily when he is off his medication"- Example: "the witch cackled madly"- Example: "screaming dementedly"[syn: insanely, crazily, dementedly, madly]
WordNet (r) 3.0 (2006):
dementedly
    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]