adjective (a)

• relating to a single dimension or aspect; having no depth or scope(adj.all)

  Example:
  A novel with one-dimensional characters.
  

  Synonym:
  unidimensional
  Antonym:
  multidimensional
  

  source: wordnet30
• of or in or along or relating to a line; involving a single dimension(adj.all)

  Synonym:
  linear
  Antonym:
  planar, two-dimensional
  

  source: wordnet30