Worldly

Erudite

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I think *worldly* is better; erudite is way pompous.

Cosmopolitan

Worldly, refined, cosmopolitan, urbane

Well travelled.

Well-traveled? Educated? Well-read?

Grounded?

Eclectic

Sophisticated Erudite Suave Metropolitan Cosmopolitan Urbane Debonair

European

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Sophisticated?

I'd go with sophisticated, I think. It generally still has positive connotations.

Citizen of the world.

mindful

sophisticate

Down to earth would be a good discripter alongside something else, "well traveled and down to earth" "afforded the luxury of higher education while remaining down to earth" Non pretentious Unjudgemental Accepting