unconquerable /ʌnˈkɒŋkəɹəbəl/adjective 1noun 1forms 1 adjective1 •Not conquerable; indomitable.Be careful when power comes to thee also, lest thou too shouldst smite in thine anger or thy jealousy, for unconquerable strength is a sore weapon in the hands of erring man. — 1886 noun1 •Someone or something that cannot be conquered. formsunconquerables