Definition of colourless in English:

colourless

(US colorless)

adjective

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