Synonyms of the word 
FULMINANT → SUDDEN
fulminant
- adj. (especially medicine) Appearing quickly and with destructive effects.
sudden
- adj. Happening quickly and with little or no warning.
- adj. (obsolete) Hastily prepared or employed; quick; rapid.
- adj. (obsolete) Hasty; violent; rash; precipitate.
- adv. (poetic) Suddenly.
- n. (obsolete) An unexpected occurrence; a surprise.
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