formidable
Pronunciation:
/fɔːˈmɪdəbəl//fɔːɹˈmɪdəbəl/adjective
Definitions
Causing fear, dread, awe, or discouragement as a result of size, strength, or some other impressive feature; commanding respect; causing wonder or astonishment.
Difficult to defeat or overcome.
Example: a formidable opponent