Formidably means to a degree that inspires respect and some fear. Formidably well prepared.
It is admiring rather than frightened, which is the balance the word keeps. The Latin behind it means causing dread, and English has softened it considerably.
1adverbformidablyTo a degree that inspires respect and some fear.
“She was formidably well briefed and everybody in the room knew it.”
formidably is a manner.
Latin formidabilis comes from formidare, to fear or dread.
Latin
formīdō — to fear, dread
English, today
formidably
From Latin formīdō (“to fear, dread”) -ably.
Etymology from Wiktionary, CC BY-SA