Definition of colourless in English:

colourless

(US colorless)

adjective

1(especially of a gas or liquid) without colour.
‘a colourless liquid’
‘colourless nail varnish’
- ‘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.’
- ‘In its pure state, nicotine is a colorless, oily, acrid liquid.’
- ‘Some other liquids may be clear and colorless, but water is unique!’
- ‘At room temperature, formaldehyde is an extremely reactive colorless gas with a suffocating odor.’
- ‘Coconut oil is a colorless to pale brownish yellow oil with a melting point starting at 26 § C.’
- ‘At room temperature and standard pressure ethers are colorless, neutral liquids with pleasant odors.’
- ‘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.’
- ‘Because carbon dioxide is colorless, odorless and disperses immediately into the air, few realize how much spills out of tailpipes and smokestacks.’
- ‘It is a colourless gas produced by the decay of organic matter such as raw sewage, oils, and salt water.’
- ‘Radon condenses to a clear, colorless liquid at its boiling point and then freezes to form a yellow, then orangish red solid.’
- ‘Ethene is a colorless gas that can be collected from natural gas and crude oil.’
- ‘Chemically, nitrous oxide is a colorless gas with a slightly sweet odor and no appreciable taste at normal ambient temperature and pressure.’
- ‘The distilled essential oil is colourless or tinged very pale yellow so it does not stain.’
- ‘The rare gases are all colorless, odorless, and tasteless.’
- ‘Sarin is a clear, colorless, and tasteless liquid that has no odor in its pure form.’
- ‘Carbon monoxide is colourless and odourless, and is produced when gas fails to burn completely.’
- ‘When it leaves the still, tequila, like most spirits, is colorless.’
- ‘Radon is a naturally occurring colourless, odourless gas that is emitted from rocks containing minerals rich in the transuranic elements.’
- ‘At normal room temperatures and pressures ammonia exists as a colorless gas that is lighter than air and has a characteristic pungent odor.’
- ‘Phosphine, generated from aluminum phosphide and water, is a highly toxic, colorless gas with a fishy or garlic-like odor.’
- ‘This colorless, solid cream works to temporarily fill in lines and large pores, and leaves a soft, opalescent finish that feels very silky.’
uncoloured, white, bleached, faded, washed out
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1. 1.1 Dull or pale in hue.
  ‘her colourless cheeks’
  ‘Pale, colorless hair poked out from between the bandages that covered his head, and his eyes were a bloodshot yellow.’
  ‘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.’
  ‘Beryl looks frightened, her face drawn and colorless.’
  ‘I turned him round and his lips were blue, his eyes were colourless and he was lifeless.’
  ‘Both were a deep green color that caused the grey of his eyes to appear pale and colorless in comparison.’
  ‘Big black patches had settled under my eyes, and my lips and cheeks were horribly colorless.’
  ‘Tabitha, who once could have been the toast of the town, was looking drawn and colorless.’
  ‘He had tiny, tiny little eyes, and pale colorless and limp hair, that was badly in need of a cutting.’
  ‘I knew that when he said that my face went more colorless than it already is except for red across my cheeks.’
  ‘The palest of blue eyes, almost colorless, scanned the room from under a fashionable coiffure of blond hair.’
  ‘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.’
  ‘Her skin hung off her face in limp saggy folds, colorless and gray, like wet cement.’
  ‘His face was nearly colorless, his skin pale and waxen.’
  ‘With rather thin lips and colorless cheeks, he bore the distinguished face of an ailing man.’
  ‘The light was harsh, the sky was flat and colourless and there were no clouds.’
  ‘Her skin was incredibly pale, almost colorless, and her eyes were dull.’
  ‘Thick, curling eyelashes shaded her lowered eyes, standing against dark yet colorless cheeks.’
  ‘His cheeks were colorless and the sweat trickled from his brow.’
  ‘His skin was, sure enough, pale and colorless.’
  ‘Pale, almost colorless eyes looked out from under thin brows.’
  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
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2Lacking distinctive character or interest; dull.
‘the book is rather colourless, like its author’
- ‘What we saw that day was colourless, dull and unimaginative.’
- ‘It has been characterised as an era of colourless politicians, ill-judged initiatives in foreign policy, tentative reforms, parliamentary corruption, and economic weakness.’
- ‘His family life was dreary; his married life colourless.’
- ‘She knew that without Davie her world would be colorless and dull.’
- ‘His colorless mediocrity exemplifies why I lost interest in the team.’
- ‘Depression is not beautiful and romantic; it's dismal and colourless and sad and boring.’
- ‘Unlike many of the colourless characters in golf, there is much more to him than putting and winning tournaments.’
- ‘Life without restriction is, colorless, jaded, and uninspired.’
- ‘Visually, it's as exciting as a soap opera: flat and colourless.’
- ‘They have a talented squad, but their performances are so often colourless and mediocre.’
- ‘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.’
- ‘It's so colourless, so dull, so hellish here, a very poor substitute for what I've lost.’
- ‘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.’
- ‘Seldom in world history can so much power have been wielded by such an apparently colourless character.’
- ‘Worse, his singing continues to be monotonously loud and colorless, without a trace of grace, style, or musical shape.’
- ‘Everything is a uniform shade of grey, built out of old power station parts and conduits, populated by drab, colourless people.’
- ‘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?’
- ‘The world seemed dull and colorless, and gray as Paula's despairing heart.’
- ‘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.’
uninteresting, dull, boring, tedious, monotonous, dry, drab, dreary, wearisome
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