MURDEROUSLY
amok, amuck, murderously
(adverb) in a murderous frenzy; “rioters running amuck and throwing sticks and bottles and stones”
murderously
(adverb) as if bent on murder; “the huge dog bore down on them with bared fangs and barking murderously”
Source: WordNet® 3.1
Etymology
Adverb
murderously (comparative more murderously, superlative most murderously)
In a murderous manner; as if wanting to commit murder; extremely angrily.
They decided to stop arguing over which spelling was correct after she began glaring murderously at each person who participated.
Source: Wiktionary
MURDEROUS
Mur"der*ous, a.
Definition: Of or pertaining to murder; characterized by, or causing,
murder or bloodshed; having the purpose or quality of murder; bloody;
sanguinary; as, the murderous king; murderous rapine; murderous
intent; a murderous assault. "Murderous coward." Shak.
– Mur"der*ous*ly, adv.
Syn.
– Bloody; sanguinary; bloodguilty; bloodthirsty; fell; savage;
cruel.
Source: Webster’s Unabridged Dictionary 1913 Edition