col·or·less /ˈkʌlɚ/
  (a.)無色的
  Col·or·less, a.
  1. Without color; not distinguished by any hue; transparent; as, colorless water; a colorless gas. 
  Note: [Narrower terms: ashen, bloodless, livid, lurid, pale, pallid, pasty, wan, waxen; neutral; white] [Also See: achromatic, colorless.]
  2. Free from any manifestation of partial or peculiar sentiment or feeling; not disclosing likes, dislikes, prejudice, etc.; as, colorless music; a colorless style; definitions should be colorless.
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  colorless
       adj 1: lacking in variety and interest; "a colorless and
              unimaginative person"; "a colorless description of the
              parade" [syn: colourless] [ant: colorful]
       2: weak in color; not colorful [syn: colourless] [ant: colorful]