* The wrestler's strongness was evident in his powerful throws. (Emphasizing the strength itself)
* The metal's strongness allowed it to withstand the intense heat. (Focusing on the quality of being strong)
* He attributed his success to his strongness of character. (Using strongness in a more metaphorical sense)
It's important to note that while "strongness" is grammatically correct, it is not as commonly used as "strength." "Strength" is often a more versatile and preferable word choice in most contexts.