one-dimensional
adjective /ˌwʌn daɪˈmenʃənl/,  /ˌwʌn dɪˈmenʃənl/
  /ˌwʌn daɪˈmenʃənl/,  /ˌwʌn dɪˈmenʃənl/
- having only one of the following: height, length or width- These are one-dimensional structures in which the electrons can move in only one spatial direction.
 
- (disapproving) without depth or variety and so not interesting- He is something of a dull and one-dimensional villain.