Simpatico, although it is Spanish, is a word definitely used by English speakers in the US, although you won't find it common in every region. In context, "To have a voice teacher as simpatico as Suzanne has made a tremendous difference in learning to sing." "To find simpatico Mudcatters in the chat room makes Mudchat an addictive pastime." "An audience that is simpatico turns a performance into a bonding experience." "She was so simpatico that we became fast friends from the day we met."