The definition of a mensch is a person who is decent, honest and upstanding.(noun)
An all-around good guy who can be trusted and who does good things is an example of a mensch.
See mensch in Webster's New World College Dictionary
noun pl. menschen
Origin: Yiddish < Ger, person < OHG mannisco, orig., human < mann, man + isc-, -ish
See mensch in American Heritage Dictionary 4
or menshnoun pl. mensch·es or mensch·en (mĕnˈshən)
Origin: Yiddish, human being, mensch
Origin: , from Middle High German, human being
Origin: , from Old High German mennisco; see man-1 in Indo-European roots.
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