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disastrous

dis·as·trous

disastrous

pronunciation:
dih zae strs
part of speech: adjective
definition: causing grave harm, loss, ruin, or the like; tragic or calamitous.
synonyms:
calamitous, catastrophic, ruinous, tragic
similar words:
costly, destructive, dire, fatal, grievous, harmful, ill-fated, terrible
derivation: disastrously (adv.)