a murderer (especially one who kills a prominent political figure) who kills by a treacherous surprise attack and often is hired to do the deed; "his assassins were hunted down like animals"; "assassinators of kings and emperors"
a member of a secret order of Muslims (founded in the 12th century) who terrorized and killed Christian Crusaders
making claim to or creating an appearance of (often undeserved) importance or distinction; "a pretentious country house"; "a pretentious fraud"; "a pretentious scholarly edition"