Being trustworthy as genuine; original; the real thing.A quote about authentic: "When I'm finishing a picture I hold some God-made object up to it ? a rock, a flower, the branch of a tree or my hand ? as a kind of final test. If the painting stands up beside a thing man cannot make, the painting is authentic. If there's a clash between the two, it is bad art." Marc Chagall (1887-1985), Russian-French painter, graphic artist. Saturday Evening Post, December 2, 1962. Also see chinoiserie, collectible, and signature.