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Webster 1828 Edition

adv.

With impetuous motion or agitation; violently; vehemently; as, to run furiously; to attack one furiously.

furiously

In a furious manner; angrily.
He glared furiously at the offender.‎
Quickly; frantically; with great effort or speed.
He tried furiously to get it to work before the deadline.‎
Intensely, as with embarrassment.
- 2004, Clara Mille, Under The Southern Cross (page 86)
  Craig, who at twenty was taller than his father, blushed furiously as he practically threw two small boxes on the table in front of the twins. “Happy birthday”, he managed.

in a furious manner; angrily

frantically