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[sallymn]

lethiferous [li-thif-er-uhs]

adjective:
bringing death or destruction, deadly

Examples:

Early on in the game, Lux meets a mysterious female named Charlotte, who is the character with pink hair. Charlotte has lost her memories, but has very lethiferous powers. (Amy Thomas, Forbidden Magna details stop by Lux's inn, meet Charlotte, Beatrice, Diana, and their weapons, neoseeker, February 2014)

But these were as things of yesteryear, bearing at least the memory or the intimation of life, compared with the awesome and lethiferous antiquity, the cycle-enduring doom of a petrified sterility, that seemed to invest Yoh-Vombis. (Clark Ashton Smith, 'The Vaults of Yoh-Vombis')

To love deeply and to break up is just a small thing. But seems lethiferous and pestilent. (Deepak Dubey, Good Night Dear Eddie)

Those that are really lethiferous, are but peccatorum sudores, excrescences of sin, & came in with the thorns. (John Robinson, A Calm Ventilation of Pseudodoxia Epidemica)

Origin:

Latin lethifer, letifer lethiferous (from letum death + -fer -ferous) + English -ous(Merriam-Webster)