adjective (a)

• out of proportion(adj.all)

  Synonym:
  disproportionate, disproportionately
  Antonym:
  proportionate
  

  source: wordnet30
• Not having due proportion to something else; not having proportion or symmetry of parts; unsuitable in form, quantity or value; inadequate; unequal; as, a disproportional limb constitutes deformity in the body; the studies of youth should not be disproportional to their understanding.(adjective)

  source: webster1913