Definition of colourless in English:

colourless

(US colorless)

adjective

  • 1(especially of a gas or liquid) without colour:

    ‘a colourless liquid’
    ‘colourless nail varnish’
    • ‘Sarin is a clear, colorless, and tasteless liquid that has no odor in its pure form.’
    • ‘Because carbon dioxide is colorless, odorless and disperses immediately into the air, few realize how much spills out of tailpipes and smokestacks.’
    • ‘At atmospheric temperatures, ozone is a colorless gas with an odor similar to chlorine that can usually be detected at a level of about 0.01 parts per million.’
    • ‘At room temperature, formaldehyde is an extremely reactive colorless gas with a suffocating odor.’
    • ‘It is a colourless gas produced by the decay of organic matter such as raw sewage, oils, and salt water.’
    • ‘Chemically, nitrous oxide is a colorless gas with a slightly sweet odor and no appreciable taste at normal ambient temperature and pressure.’
    • ‘In its pure state, nicotine is a colorless, oily, acrid liquid.’
    • ‘Ethene is a colorless gas that can be collected from natural gas and crude oil.’
    • ‘Carbon monoxide injuries and deaths occur when levels of the tasteless, odorless and colorless gas build up in poorly ventilated spaces where a carbon-based fuel is burned.’
    • ‘Carbon monoxide is a colorless, odorless gas that can poison you if you breathe too much of it.’
    • ‘This colorless, solid cream works to temporarily fill in lines and large pores, and leaves a soft, opalescent finish that feels very silky.’
    • ‘The distilled essential oil is colourless or tinged very pale yellow so it does not stain.’
    • ‘Some other liquids may be clear and colorless, but water is unique!’
    • ‘Phosphine, generated from aluminum phosphide and water, is a highly toxic, colorless gas with a fishy or garlic-like odor.’
    • ‘At normal room temperatures and pressures ammonia exists as a colorless gas that is lighter than air and has a characteristic pungent odor.’
    • ‘Radon is a naturally occurring colourless, odourless gas that is emitted from rocks containing minerals rich in the transuranic elements.’
    • ‘When it leaves the still, tequila, like most spirits, is colorless.’
    • ‘Coconut oil is a colorless to pale brownish yellow oil with a melting point starting at 26 § C.’
    • ‘Radon condenses to a clear, colorless liquid at its boiling point and then freezes to form a yellow, then orangish red solid.’
    • ‘The rare gases are all colorless, odorless, and tasteless.’
    • ‘Carbon monoxide is colourless and odourless, and is produced when gas fails to burn completely.’
    • ‘At room temperature and standard pressure ethers are colorless, neutral liquids with pleasant odors.’
    uncoloured, white, bleached, faded, washed out
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    1. 1.1 Dull or pale in hue:
      ‘her colourless cheeks’
      • ‘Thick, curling eyelashes shaded her lowered eyes, standing against dark yet colorless cheeks.’
      • ‘The palest of blue eyes, almost colorless, scanned the room from under a fashionable coiffure of blond hair.’
      • ‘Pale, almost colorless eyes looked out from under thin brows.’
      • ‘Pale, colorless hair poked out from between the bandages that covered his head, and his eyes were a bloodshot yellow.’
      • ‘Her skin was incredibly pale, almost colorless, and her eyes were dull.’
      • ‘His face was nearly colorless, his skin pale and waxen.’
      • ‘I knew that when he said that my face went more colorless than it already is except for red across my cheeks.’
      • ‘Both were a deep green color that caused the grey of his eyes to appear pale and colorless in comparison.’
      • ‘He had tiny, tiny little eyes, and pale colorless and limp hair, that was badly in need of a cutting.’
      • ‘Beryl looks frightened, her face drawn and colorless.’
      • ‘When I placed the sandwich and salad before her, she looked up at me and gave a weak smile; I noticed how colorless her lips were and how gray her hair was becoming.’
      • ‘I turned him round and his lips were blue, his eyes were colourless and he was lifeless.’
      • ‘The light was harsh, the sky was flat and colourless and there were no clouds.’
      • ‘Tabitha, who once could have been the toast of the town, was looking drawn and colorless.’
      • ‘His cheeks were colorless and the sweat trickled from his brow.’
      • ‘Her skin hung off her face in limp saggy folds, colorless and gray, like wet cement.’
      • ‘A tear slipped down Michael's colorless cheek, and he was grateful that Justin suddenly became fascinated with the view so he could wipe it away undetected.’
      • ‘With rather thin lips and colorless cheeks, he bore the distinguished face of an ailing man.’
      • ‘His skin was, sure enough, pale and colorless.’
      • ‘Big black patches had settled under my eyes, and my lips and cheeks were horribly colorless.’
      pale, pallid, wan, anaemic, bloodless, ashen, white, white as a ghost, white as a sheet, grey, jaundiced, waxen, chalky, chalk-white, milky, pasty, pasty-faced, whey-faced, peaky, sickly, tired-looking, washed out, sallow, drained, drawn, sapped, ghostly, deathly, deathlike, bleached
      View synonyms
  • 2Lacking distinctive character or interest; dull:

    ‘the book is rather colourless, like its author’
    • ‘Depression is not beautiful and romantic; it's dismal and colourless and sad and boring.’
    • ‘Everything is a uniform shade of grey, built out of old power station parts and conduits, populated by drab, colourless people.’
    • ‘She knew that without Davie her world would be colorless and dull.’
    • ‘It has been characterised as an era of colourless politicians, ill-judged initiatives in foreign policy, tentative reforms, parliamentary corruption, and economic weakness.’
    • ‘Worse, his singing continues to be monotonously loud and colorless, without a trace of grace, style, or musical shape.’
    • ‘Visually, it's as exciting as a soap opera: flat and colourless.’
    • ‘His colorless mediocrity exemplifies why I lost interest in the team.’
    • ‘The country has had a coalition government of right and left parties for some time, which has increasingly been criticised for being too colourless and weak.’
    • ‘They have a talented squad, but their performances are so often colourless and mediocre.’
    • ‘This does not mean that his account is bland and colourless, but he is striving for scholarly objectivity and clarity as far as that is possible under the circumstances.’
    • ‘It's so colourless, so dull, so hellish here, a very poor substitute for what I've lost.’
    • ‘Life without restriction is, colorless, jaded, and uninspired.’
    • ‘Unlike many of the colourless characters in golf, there is much more to him than putting and winning tournaments.’
    • ‘His family life was dreary; his married life colourless.’
    • ‘A couple of seasons of too much talk, too many colorless characters, and not enough action have left the show in limbo.’
    • ‘Beyond that, her soprano is strangely colorless, and her projection of the text flat and matter-of-fact.’
    • ‘Did this man whose entire life has been spent as an office worker in dull and colorless businesses in rural Pennsylvania just suddenly have a Walter Mitty fantasy that happened to come true?’
    • ‘What we saw that day was colourless, dull and unimaginative.’
    • ‘Seldom in world history can so much power have been wielded by such an apparently colourless character.’
    • ‘The world seemed dull and colorless, and gray as Paula's despairing heart.’
    uninteresting, dull, boring, tedious, monotonous, dry, drab, dreary, wearisome
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Pronunciation:

colourless

/ˈkʌləlɪs/