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Definition of colourless adjective from the Oxford Advanced Learner's Dictionary

colourless

adjective
 
/ˈkʌlələs/
 
/ˈkʌlərləs/
(US English colorless)
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  1. without colour or very pale
    • a colourless liquid like water
    • colourless lips
    Extra Examples
    • a clear, almost colourless liquid
    • Her illness had left her face deathly white and her lips colourless.
    • The reaction will produce a colourless liquid.
    • Water is a colourless compound of hydrogen and oxygen.
  2. not interesting synonym dull
    • a colourless personality
    Extra Examples
    • ‘I suppose so,’ she said in a colourless voice.
    • He was a small, colourless man who worked as a clerk.
    • Too many passive verbs make for flabby, colourless prose.
See colourless in the Oxford Learner's Dictionary of Academic English

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