D defs.my
Entry 1 sense Webster, 1913

Formidable

/fôr'-məd-əb-əl/ · For·mi·da·ble · IPA /ˈfɔɹmɪdəbəl/
01 a. Exciting fear or apprehension; impressing dread; adapted to excite fear and deter from approach, encounter, or undertaking; alarming.
  1. 1.
    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.