foudroyant adjective. 
[fu:'drɔɪǝnt, fudrwaj] M19.[French, pres. pple of foudroyer strike (as) with lightning, from foudre from Latin fulgur lightning: see -ANT1.]1.  Thunderous, noisy. Also, dazzling. 
M19.2.  Of a disease: beginning suddenly and in a very severe form. 
L19.  [TahlilGaran] English Dictionary ▲