colourless

colourless or US colorless

Adjective

1. without colour: a colourless gas

2. dull and uninteresting: a colourless personality

3. grey or pallid in tone or hue: a watery sun hung low in the colourless sky

Thesaurus

Adj.	1.	colourless - lacking in variety and interest; "a colorless and unimaginative person"; "a colorless description of the parade" colorless dull - lacking in liveliness or animation; "he was so dull at parties"; "a dull political campaign"; "a large dull impassive man"; "dull days with nothing to do"; "how dull and dreary the world is"; "fell back into one of her dull moods" colourful, colorful - striking in variety and interest; "a colorful period of history"; "a colorful character"; "colorful language"
	2.	colourless - weak in color; not colorful colorless achromatic, neutral - having no hue; "neutral colors like black or white"

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colourless

adjective 1. uncoloured, faded, neutral, bleached, washed out, achromatic

2. ashen, washed out, wan, sickly, anaemic << OPPOSITE radiant

adjective 3. uninteresting, dull, tame, dreary, drab, lacklustre, vacuous, insipid, vapid, characterless, unmemorable << OPPOSITE interesting