Lethal (adjective) مہلک، جان لیوا

very harmful or destructive.
Example: “the Krakatoa eruption was the most lethal on record”
Synonyms: fatal, deadly, mortal, causing death, death-dealing, life-threatening, murderous, homicidal
Antonyms: harmless, safe
Slay (verb) قتل کرنا، مار ڈالنا

kill (a person or animal) in a violent way.
Example: “St George slew the dragon”
Synonyms: kill, murder, put to death, do to death, put to the sword, butcher, cut down, cut to pieces
Antonyms: resurrect, reanimate, resuscitate