When we say "show magnanimity", we are referring to being gracious, generous, and forgiving. There are various synonyms that we can use to convey this concept. For instance, we can use "display nobility", which connotes displaying a virtuous and honorable character. "Show leniency" is also a suitable alternative as it pertains to being forgiving and merciful. To "exhibit tolerance" can also be a substitute as it implies being accepting and patient with others. "Demonstrate benevolence" implies acts of kindness and goodwill towards others. Ultimately, whichever synonym we choose to use, it is essential to always show goodwill and generosity towards others.