Liberal Dictionary English Dictionary
adjective
- causing great distress or injury; ruinous; very unfortunate; calamitous: The rain and cold proved disastrous to his health.
- Archaic. foreboding disaster.
1580s, “ill-starred,” from French désastreux (16c.), from désastre (see disaster) or from Italian desastroso. Meaning “calamitous” is from c.1600. Related: Disastrously.