ˈfyu̇rēəs, -ür- adjective
Etymology: Middle English, from Middle French furieus, from Latin furiosus, from furia madness, rage, fury + -osus -ous — more at fury
1.
a. : exhibiting or goaded by anger or passion : fierce , violent
fully expects a furious renewal of the attacks against him — Howard Rushmore
makes me furious to think what slaves we were — Corra Harris
b. : appearing or moving as if angry : stormy , turbulent
the furious outbursts of swirling flame from the palaces which have been set on fire — Laurence Binyon
c. : full of noise and excitement : boisterous
ducking one another, dashing water with cupped hands, the fun was fast and furious — C.P.Conigrave
d. : full of activity : energetic , vigorous
this loading job normally consumed for the … crew a leisurely day — or a furious half of one — Wirt Williams
2.
a. : existing in the height of its distinctive character : intense
everywhere the ecstatic green of California's brief and furious spring — Wallace Stegner
b. : characterized by excess : extravagant
lost such furious sums — Mary W. Montagu
3.
a. Scots law : mentally deranged : insane
b. : characterized by unreasoned enthusiasm : fanatical
gradually formulated a theory to support his furious conviction — Time