candid (or plainspoken, frank or direct) adj. foursquare

[The small Bank of Wilmington] is managed by local people who … when they say hello, use your name in the same sentence and their smiles are sincere and you know it. These are foursquare, forthright people who make sure that the depositor feels appreciated. (Malcolm Berko, “Small Banks and Long-Term Investments,” The Courier (Waterloo, Iowa), 7/05/2005.)

foursquare can also be a synonym for straightforward, honest, blunt, upfront, or forthright