CUTTHROAT
cutthroat, fierce, bowelless
(adjective) ruthless in competition; “cutthroat competition”; “bowelless readiness to take advantage”
cutthroat
(noun) someone who murders by cutting the victim’s throat
Source: WordNet® 3.1
Etymology
Noun
cutthroat (countable and uncountable, plural cutthroats)
A murderer who slits the throats of victims.
An unscrupulous, ruthless or unethical person.
(uncountable) A three-player pocket billiards game where the object is to be the last player with at least one ball still on the table.
Adjective
cutthroat (comparative more cutthroat, superlative most cutthroat)
Involving the cutting of throats
Of or relating to a card game where everyone plays for him or herself rather than playing with a partner.
Ruthlessly competitive, dog-eat-dog
Source: Wiktionary
Cut"throat` (kt"thrt`), n.
Definition: One who cuts throats; a murderer; an assassin.
Cut"throat`, a.
Definition: Murderous; cruel; barbarous.
Source: Webster’s Unabridged Dictionary 1913 Edition