I. -trəs sometimes -tərəs adjective
Etymology: Middle French & Old Italian; Middle French desastreux, from Old Italian disastroso, from disastro disaster + -oso (from Latin -osus -ous)
1. archaic : subject to or affected by disaster : unlucky , ill-fated
2. archaic : full of unfavorable stellar influences : unpropitious , ill-boding
3. : attended by or productive of suffering or disaster : very unfortunate : calamitous
a disastrous day
a disastrous termination
Synonyms: see unlucky
II. adjective
: extremely bad : terrible
she was a disastrous mother — Garry Wills