broad-minded adj.

"unbiased, open-minded, free from prejudice or bigotry," 1590s; see broad (adj.) + -minded. This abstract mental sense of broad existed in Old English; for example in bradnes "breadth," also "liberality."

[Broad-mindedness] is the capacity to take a wide and comprehensive view of truths and of their manifold bearings, to give them their proportionate emphasis, to discern their internal connection, and to discriminate between truth and caricature. It has nothing to do with compromise of any kind, nor with schemes of toleration and comprehension. [The Church Eclectic, November 1898]