magnanimous
adjective
generous in forgiving an insult or injury; free from petty resentfulness or vindictiveness.
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Titian grasped with imperious tenacity his supremacy as a painter, sedulously kept the secrets of his skill, and was most unmagnanimously jealous of the attainments of his scholars.
From The Old Masters and Their Pictures For the Use of Schools and Learners in Art by Sarah Tytler