Webster's Revised Unabridged Dictionary · 1913

Disastrous

Disastrous , adjective

[Compare French désastreux. See Disaster.]

1.
Full of unpropitious stellar influences; unpropitious; ill-boding. [Obsolete]
The moon In dim eclipse, disastrous twilight sheds. — Milton
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. — Shakespeare