opacity (from the Oxford Dictionary of English)
n. [mass noun] the quality of lacking transparency of translucence: thinner paints need black added to increase opacity.
- the quality of being obscure in meaning: the difficulty and opacity in Barthes’ texts.
<ORIGIN> mid 16th century: from French opacité, from Latin opacitas, from opacus ‘darkened’.
The Republican Party seeks to bring opacity back into government.