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> I don’t know a single-word corollary to ‘Simpatico’ in English.

"amiable"? "congenial"? "affable"?

I wonder what the parent meant by "corollary"? Simpatico is actually an English word now..

Is that USA English? Never heard/read it at all in UK, not even in a crossword. Nor, ever online (here, reddit, etc.) or from other global sources.

It's in Oxford online and Merriam Webster.