Source : Webster's Revised Unabridged Dictionary (1913)

Asymmetric \As`ym*met"ric\, Asymmetrical \As`ym*met"ri*cal\, a.
   [See {Asymmetrous}.]
   1. Incommensurable. [Obs.]

   2. Not symmetrical; wanting proportion; esp., not bilaterally
      symmetrical. --Huxley.

Source : WordNet®

asymmetrical
     adj 1: characterized by asymmetry in the spatial arrangement or
            placement of parts or components [syn: {asymmetric}]
            [ant: {symmetrical}]
     2: irregular in shape or outline; "asymmetrical features"; "a
        dress with an crooked hemline" [syn: {crooked}]