murderous

1. (often figuratively) Of an object: used to commit murder; capable of causing death; deadly, fatal.Examples: "The rapid ſquadrons ſwift as thought engage, / And ſeek the hoſtile troops who ſhun their rage, / 'Midſt the thick clouds which ſmoak and duſt afford / With dreadful luſtre gleams the murderous ſword; […]"; "In neceſſary ſelf-defence men have a right to kill their aſſailants. But duelling is unlawful and murderous, a remain of the ancient Gothic barbarity."; "In street fighting at close quarters a gun of this kind is very murderous and ought to do a terrible amount of destruction."Antonyms: nonmurderous, unmurderousfigurativelyoften

2. (by extension) Very difficult.Examples: "a murderous exam"; "conditions were murderous"Synonyms: killing, arduous, challenging, nasty, difficult, effortful, hard, rockyAntonyms: challenging, complex, difficult, esoteric, hard, tough, tricky, uneathbroadly