colorless

Adjective

colourless (comparative more colourless, superlative most colourless)

1. (UK) Having little or no colour.
   • The servant to whom he put this question was a young fellow with chubby cheeks, small, dull eyes, and a round chin, covered with a colorless down.1867, Ivan Sergheïevitch Turgenef [i.e., Ivan Turgenev], chapter I, in Eugene Schuyler, transl., Fathers and Sons […], New York, N.Y.: Leypoldt and Holt, →OCLC, page 1

   Synonyms:

   dull, dingy, achromatic, colorless, hueless, bland, dim, faint, lackluster, leaden

2. (UK) Water white.

   Synonyms:

   clear, waterlike, clear as crystal, crystalline, diaphanous, glassy, hyaline, hyaloid, limpid, lucid

3. (UK) Lacking in interest or variety.

   Synonyms:

   drab, dull, banal, basic, mindless, beat, blah, commonplace, bland, boring

4. (UK) Neutral in opinion or allegiance; centrist
   • They cannot, of course, assume a colourless position because they cater to the radical rank and file and would be branded renegades.1926, David Joseph Saposs, Left Wing Unionism: A Study of Radical Policies and Tactics, page 73

   Synonyms:

   moderate