The story
- Latin · derived fromformīdābilis“formidable, terrible”
- Old French · derived fromformidable
- Middle English · inherited fromformidable
- English todayformidable
From 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 4.0.