FORMIDABLE /fɔːˈmɪdəbəl/ ► audio Scrabble 18 Words With Friends 21 Definition adjective extremely impressive in strength or excellence. adjective inspiring fear. — synonyms: redoubtable, unnerving Examples “a formidable opponent” See all 660 words you can make from FORMIDABLE → 10-letter words Words starting with F Words ending with E ← Unscramble different letters