one-dimensional

See also: onedimensional

English edit

one-dimensional (comparative more one-dimensional, superlative most one-dimensional)

Having length, but no width, height or depth.
A straight line is one-dimensional.
(figuratively) Lacking depth or believability; flat.
- 1972, Hardie Albright, Stage direction in transition:
  Such one-dimensional characters have always existed in the theatre along with more recognizably human characters.
- 1999, Kimberly Kimbell-Lopez, Connecting with traditional literature:
  In contrast to this are the flat, one-dimensional characters found in fables.
(figuratively) Lacking personal depth and substance; conceited, vain, shallow, superficial.

having length, but no width, height or depth

figuratively, lacking depth or believability