colorless uncolored, achromatic mean without color. However, they are not freely interchangeable.
Colorless is applied to something that is transparent

water is a colorless liquid

or to something that is bleached, blanched, or pallid

colorless leaves


colorless cheeks and lips

Uncolored is applied to something that is left in its natural state or is not dyed or stained

uncolored oranges

or to objects which have not been touched or touched up with color

an uncolored photograph

Achromatic is applied to something that is free from any of the hues in the spectrum or from any hues formed by combinations of these or that gives images which are free from extraneous colors produced by refraction

an achromatic color


an achromatic telescope

A color (in its inclusive sense) may be chromatic or achromatic: if the former, it has a hue; if the latter, it has not and is, therefore, white, black, or a pure gray.
Analogous words: *pale, pallid, ashen, wan: whitened, blanched, bleached, decolorized (see WHITEN)
Antonyms: colorful

New Dictionary of Synonyms. 2014.


Look at other dictionaries:

  • Colorless — Col or*less, a. 1. Without color; not distinguished by any hue; transparent; as, colorless water; a colorless gas. Note: [Narrower terms: {ashen, bloodless, livid, lurid, pale, pallid, pasty, wan, waxen}; {neutral}; {white}] [Also See:… …   The Collaborative International Dictionary of English

  • colorless — [adj1] without hue achromatic, achromic, anemic, ashen, ashy, blanched, bleached, cadaverous, doughy, drab, dull, faded, flat, ghastly, livid, lurid, neutral, pale, sickly, uncolored, wan, washed out, waxen, white; concept 618 Ant. brilliant,… …   New thesaurus

  • colorless — index insipid, jejune (dull), lifeless (dull), mediocre, pedestrian, prosaic, usual …   Law dictionary

  • colorless — late 14c., from COLOR (Cf. color) + LESS (Cf. less). Figurative sense of lacking vividness is recorded from 1861 …   Etymology dictionary

  • colorless — (Amer.) col·or·less || kÊŒlÉ™(r)lɪs adj. pale; lacking color; dull, boring (also colourless) …   English contemporary dictionary

  • colorless — [kul′ər lis] adj. 1. without color 2. dull in color; gray or pallid 3. lacking variety or interest; dull colorlessly adv. colorlessness n …   English World dictionary

  • colorless — colorlessly, adv. colorlessness, n. /kul euhr lis/, adj. 1. without color: Pure water is colorless. 2. pallid; dull in color: a colorless complexion. 3. lacking vividness or distinctive character; dull; insipid: a colorless description of the… …   Universalium

  • colorless — col|or|less [ kʌlərləs ] adjective 1. ) something that is colorless has no color: a colorless, odorless, and poisonous gas 2. ) not interesting, exciting, or original: a colorless description …   Usage of the words and phrases in modern English

  • colorless — adjective 1) a colorless liquid Syn: uncolored, white, bleached; literary achromatic Ant: colored 2) her colorless face Syn: pale, pallid, wan, anemic, b …   Thesaurus of popular words

  • colorless — adjective Date: 14th century lacking color: as a. pallid, blanched < a colorless complexion > b. dull, uninteresting < colorless prose > • colorlessly adverb • colorlessness noun …   New Collegiate Dictionary

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