deathful
Involving the danger of death; fatal, deadly.
Five hapless swains with soft allusive smiles / The harlot meshes in her deathful toils […].
Resembling or pertaining to death; deathly.
Subject to death; mortal.
literary
Where it comes from
From Middle English dethful, equivalent to death + -ful.
Adapted from the Wiktionary entry deathful (CC BY-SA 4.0).