opaque

See also: opaqué

English

Alternative forms

• opake (obsolete)

Etymology

From Middle English opake, from Latin opacus (“shaded, shady, dark”) (of unknown origin), later reinforced from Middle French opaque. Doublet of ubac.

Pronunciation

• IPA^(key): /əʊˈpeɪk/

• Audio (UK):

  (file)

• IPA^(key): /oʊˈpeɪk/
• Rhymes: -eɪk

Adjective

opaque (comparative more opaque or opaquer, superlative most opaque or opaquest) (see usage notes)

1. Neither reflecting nor emitting light.
   • 1968, Isaac Asimov, Photosynthesis, Basic Books, Inc., page 60:

     We have agreed that heat is energy to begin with. Light is also a form of energy for when absorbed by any opaque substance it turns completely into heat.

2. Allowing little light to pass through, not translucent or transparent.
3. (figuratively) Unclear, unintelligible, hard to get or explain the meaning of.
4. (figuratively) Obtuse, stupid.
5. (computing) Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.

Usage notes

• The comparative opaquer and superlative opaquest, though formed following valid rules for English, are much less common than more opaque and most opaque and seem to occur more frequently in poetry.
• Most opaque has been more common than opaquest for at least two centuries and 50 to 100 times more common in the last two decades, according to this Google Ngram comparison.

Antonyms

• (physically): see-through, translucent, transparent
• (figuratively): clear, obvious, bright, brilliant

Derived terms

• opaquely
• opaqueness
• radiopaque

Related terms

• opacity

Translations

neither reflecting nor emitting light

• Bulgarian: матов (bg) (matov)
• German: matt (de), dunkel (de)
• (deprecated template usage) {{trans-mid}}
• Italian: opaco (it)

hindering light to pass through

• Arabic: أَكْمَد m (ʔakmad)
• Belarusian: непразры́сты (njeprazrýsty)
• Catalan: opac (ca)
• Chinese:

  Mandarin: 不透明 (zh) (bù tòumíng)

• Czech: neprůhledný m
• Dutch: opaak (nl), ondoorschijnend, ondoorzichtig (nl)
• Finnish: läpinäkymätön (fi), läpikuultamaton
• French: opaque (fr) m or f
• Georgian: გაუმჭვირვალე (gaumč̣virvale), შუქგაუმტარი (šukgaumṭari)
• German: undurchsichtig (de), undurchlässig (de), opak (de), blickdicht (de)
• Greek: αδιαφανής (el) (adiafanís)
• Hungarian: átlátszatlan (hu)
• Icelandic: ógagnsær
• Italian: opaco (it) m, opaca (it) f
• Japanese: 不透明な (ja) (ふとうめいな, futōmei-na)
• (deprecated template usage) {{trans-mid}}
• Korean: 불투명하다 (bultumyeonghada)
• Latvian: necaurredzams, necaurspīdīgs
• Malay: legap
• Maori: puatakore
• Norwegian: opak, ugjennomsiktig (no), ugjennomskinnelig (no)
• Occitan: opac (oc)
• Polish: nieprzezroczysty (pl), nieprzejrzysty
• Portuguese: opaco (pt) m
• Romanian: netransparent, opac (ro)
• Russian: ма́товый (ru) (mátovyj), непрозра́чный (ru) (neprozráčnyj)
• Serbo-Croatian: neproziran (sh) m, neprozirno (sh), neprogledno, neprovidno
• Spanish: opaco (es)
• Swedish: ogenomskinlig (sv)
• Thai: ทึบแสง (tʉ́p-sɛ̌ɛng)
• Turkish: mat (tr), opak (tr), donuk (tr)
• Ukrainian: непрозо́рий (neprozóryj)

allowing little light to pass through

• Bulgarian: матов (bg) (matov)
• German: trüb (de), trübe (de), milchig
• (deprecated template usage) {{trans-mid}}
• Hungarian: homályos (hu), halvány (hu)
• Italian: offuscato (it)

unclear, unintelligible, hard to get or explain the meaning of

• Bulgarian: неясен (bg) (nejasen)
• German: unklar (de), schleierhaft (de), unverständlich (de), unverstanden
• (deprecated template usage) {{trans-mid}}
• Hungarian: homályos (hu), ködös (hu), érthetetlen (hu)
• Italian: arcano (it), oscuro (it)

obtuse, stupid

• Bulgarian: тъп (bg) (tǎp)
• German: stumpf (de), begriffsstutzig (de), schwerfällig (de)
• (deprecated template usage) {{trans-mid}}
• Hungarian: tompa (hu), bamba (hu), nehéz felfogású
• Romanian: obtuz (ro)

Noun

opaque (plural opaques)

1. (obsolete, poetic) An area of darkness; a place or region with no light.
   • 1745, Edward Young, Night-Thoughts, I:

     Through this opaque of Nature and of Soul, / This double night, transmit one pitying ray, / To lighten, and to cheer.

2. Something which is opaque rather than translucent.

Translations

area of darkness

• Bulgarian: мрак (bg) m (mrak)
• German: Undurchsichtigkeit f, Trübnis f, Dunkelheit (de) f, verschleiern (de)
• (deprecated template usage) {{trans-mid}}

something which is opaque

• German: Undurchsichtiges n, Blickdichtes n
• (deprecated template usage) {{trans-mid}}

Verb

opaque (third-person singular simple present opaques, present participle opaquing, simple past and past participle opaqued)

1. (transitive) To make, render (more) opaque.

Synonyms

• blur
• cloud

Translations

to render opaque

• Bulgarian: правя матов (pravja matov)
• German: trüben (de), mattieren (de), verdunkeln (de), verschleiern (de)
• (deprecated template usage) {{trans-mid}}

See also

• translucent

References

• Douglas Harper (2001–2024) “opaque”, in Online Etymology Dictionary.
• Webster's Seventh New Collegiate Dictionary, Springfield, Massachusetts, G.&C. Merriam Co., 1967

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French

Etymology

Borrowed from Latin opācus (“shaded, shady, dark”), itself of unknown origin. Doublet of ubac.

Pronunciation

• IPA^(key): /ɔ.pak/

• Audio:

  (file)

Adjective

opaque (plural opaques)

1. opaque

   Antonyms: transparent, translucide

Derived terms

• opacifier
  • opacification
• opacité
• opaquement

Descendants

• → Romanian: opac
• → Turkish: opak

Further reading

• “opaque”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

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Middle French

Adjective

opaque m or f (plural opaques)

1. opaque

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Spanish

Verb

opaque

1. inflection of opacar:
   1. first/third-person singular present subjunctive
   2. third-person singular imperative