INSURMOUNTABLE Scrabble 18 Words With Friends 25 Definition adjective not capable of being surmounted or overcome. — synonyms: unsurmountable adjective impossible to surmount. — synonyms: insuperable Examples “Getting everybody to agree proved to be an insurmountable difficulty.” See all 3458 words you can make from INSURMOUNTABLE → 14-letter words Words starting with I Words ending with E ← Unscramble different letters