The Collaborative International Dictionary
Disastrousness
Disastrous \Dis*as"trous\, a. [Cf. F. d['e]sastreux. See Disaster.]
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Full of unpropitious stellar influences; unpropitious; ill-boding. [Obs.]
The moon In dim eclipse, disastrous twilight sheds.
--Milton. -
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. -- Dis*as"trous*ly, adv. -- Dis*as"trous*ness, n.
Wiktionary
disastrousness
n. The state or condition of being disastrous.
Usage examples of "disastrousness".
But I am about to make a single colossal, egregious, flagrant, and appalling oversight whose disastrousness is exceeded only by its irony.