(s)flat, level, planehaving a surface without slope, tilt in which no part is higher or lower than another“a flat desk”, “acres of level farmland”, “a plane surface”, “skirts sewn with fine flat seams”
(s)two-dimensional, 2-dimensional, flatlacking the expected range or depth; not designed to give an illusion or depth“a film with two-dimensional characters”, “a flat two-dimensional painting”
(r)directly, flat, straightin a forthright manner; candidly or frankly“he didn't answer directly”, “told me straight out”, “came out flat for less work and more pay”