disastrous Meaning, Definition & Usage

  1. adjective satellite (of events) having extremely unfortunate or dire consequences; bringing ruin
    fatal; calamitous; black; fateful.
    • the stock market crashed on Black Friday
    • a calamitous defeat
    • the battle was a disastrous end to a disastrous campaign
    • such doctrines, if true, would be absolutely fatal to my theory"- Charles Darwin
    • it is fatal to enter any war without the will to win it"- Douglas MacArthur
    • a fateful error

WordNet

Dis*as"trous adjective
Etymology
Cf. F. désastreux. See Disaster.
Definitions
  1. Full of unpropitious stellar influences; unpropitious; ill-boding. Obs.
    The moon In dim eclipse, disastrous twilight sheds. Milton.
  2. Attended with suffering or disaster; very unfortunate; calamitous; ill-fated; as, a disastrous day; a disastrous termination of an undertaking.
    Wherein I spake of most disastrous chances. Shak.
    -- Dis*as"trous*ly, adv. -- Dis*as"trous*ness, n.

Webster 1913