This can be a noun or a verb. Here are some sentences with each meaning.
He went on a murderous rampage before being arrested.
Depending on how it is used in a sentence, it could be "murderous" or "murderer", or "assasin".
Murderous Maths was created in 1997.
The duration of Murderous Maids is 1.57 hours.
A Murderous Circus was created in 2005-03.
Murderous = "asesino" as an adjective.Murderous behaviour = conducta asesina
Murderous Maids was created on 2000-11-22.
Crosstown traffic is murderous at this time of day. Why is the traffic at a stop during "rush hour"? How's traffic right now?
irrelevant... murderous is adjective not a noun. It doesn't HAVE singular OR plural form..
The Murderous Moros of Mindanao - 1916 was released on: USA: 29 May 1916
Unusual Suspects - 2010 Murderous Intentions was released on: USA: 2012
Murderous Intent - 1995 TV is rated/received certificates of: Iceland:12
The cast of A Murderous Elopement - 1914 includes: Richard Rosson Vera Sisson as Mabel