10 letters · 18 points in Scrabble
adjective extremely impressive in strength or excellence
adjective inspiring fear; ; - G.H.Johnston
originFrom Middle English formidable, from Old French formidable, formible, from Latin formīdābilis (“formidable, terrible”) (whence -able), from formīdō (“fear, dread”).
Etymology from Wiktionary, CC BY-SA 3.0