COLOURLESS
colorless, colourless
(adjective) weak in color; not colorful
colorless, colourless
(adjective) lacking in variety and interest; “a colorless and unimaginative person”; “a colorless description of the parade”
Source: WordNet® 3.1
Etymology
Adjective
colourless (comparative more colourless, superlative most colourless)
Having little or no colour.
(of a liquid) Water white.
Lacking in interest or variety.
Synonyms
• (having little or no colour): see also achromatic
• (of a liquid): clear, waterlike; see also transparent
• (lacking in interest): drab, dull; see also boring
Source: Wiktionary