deadliness
nounUK /ˈdɛdlɪnəs/
Etymology From Middle English dedlinesse, deadlicnesse, from Old English dēadlīcnes, equivalent to deadly + -ness.
› Synonym of lethality.
1
Usually The quality of being deadly.
2
Usually The degree to which a thing is deadly.
3
Excessive, Figuratively, Usually Tedium, or the quality of being boring.