(adj.) something that has the potential to kill, destroy, or in any other way wreak havoc
That's quite a killful knife/spoon/other deadly utensil you have there, Mr. Assassin.
by g1235711 May 13, 2008
(adj.) something that is seen as very painful or likely to inflict pain.
"That's quite a killful knife/ sword/ spoon/ other object you have there.
by g1235711 July 23, 2008