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His understanding and
temper, though unlike her own, would have answered all her wishes.

Word:

disposition

Question:

Why would his understanding and temper, despite being different from hers, have fulfilled all her wishes?

Answer (optional):

His understanding and temper would have fulfilled all her wishes because, despite being different from hers, their union would have been advantageous to both of them. His mind might have been softened, and his manners improved by her ease and liveliness, while she would have benefited from his judgment, information, and knowledge of the world.