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OAT→calamitous

calamitous

Flag: gbEnglishOxford American Thesaurus
calamitous
adjective
the consequences of his decision were calamitous:
disastrous, catastrophic, cataclysmic, devastating, dire, tragic, fatal, ruinous, crippling, awful, dreadful, terrible, woeful, grievous;
literary direful.
▷antonyms good, advantageous.