FORMIDABLY

formidably

(adverb) in a formidable manner; “the constant risk that attends the exchanges of human beings formidably armed”

Source: WordNet® 3.1

Etymology

Adverb

formidably (comparative more formidably, superlative most formidably)

In a formidable manner

Source: Wiktionary

For"mi*da*bly, adv.

Definition: In a formidable manner.

FORMIDABLE

For"mi*da*ble, a. Etym: [L. formidabilis, fr. formidare to fear, dread: cf. F. formidable.]

Definition: Exciting fear or apprehension; impressing dread; adapted to excite fear and deter from approach, encounter, or undertaking; alarming. They seemed to fear the formodable sight. Dryden. I swell my preface into a volume, and make it formidable, when you see so many pages behind. Drydn.

Syn.

– Dreadful; fearful; terrible; frightful; shocking; horrible; terrific; tremendous.

Source: Webster’s Unabridged Dictionary 1913 Edition