D defs.my
Entry 2 senses Webster, 1913

Disastrous

/dĭz-ăs'-trəs/ · Dis·as·trous · IPA /dɪˈzæs.tɹəs/
01 a. Full of unpropitious stellar influences; unpropitious; ill-boding.
  1. 1.
    Full of unpropitious stellar influences; unpropitious; ill-boding.[Obs.]
    “The moon In dim eclipse, disastrous twilight sheds.” Milton.
  2. 2.
    Attended with suffering or disaster; very unfortunate; calamitous; ill-fated; ending in utter failure or ruin; as, a disastrous day; a disastrous termination of an undertaking.
    “Wherein I spake of most disastrous chances.” Shak.