WordRel.com

• the quality of being opaque to a degree; the degree to which something reduces the passage of light

  synonym	opaqueness
  antonym	clarity
  derivation	opaque
  attribute	opaque
  hypernym	quality
  hyponym	blurrinesscloudinessfogginessfuzzinessindistinctnessmuddinessmurkinesssoftness

• incomprehensibility resulting from obscurity of meaning

  synonym	opaqueness
  derivation	opaque
  hypernym	incomprehensibility

• the phenomenon of not permitting the passage of electromagnetic radiation

  antonym	transparency
  derivation	opaque
  hypernym	physical phenomenon
  hyponym	optical opacityradio-opacityradiopacity