Noun

(-)

(obsolete) Brightness, brilliancy.

*:

*:Thenne sayd he Fair swete fader Ihesu Cryst yf euer I dyd thyng that pleasyd the lord / for thy pyte ne haue me not in despyte for my synnes done afore tyme / and that thou shewe me some thynge of that I seke / And with that he sawe the chamber dore open and there came oute a grete clerenes / that the hows was as bryghte as all torches of the world had ben there

Mental or sensory distinctness; clarity of understanding, perception etc.

*1966 , "The Lowest Depths", Time , 6 September:

*:The daily press is the evil principle of the modern world, and time will only serve to disclose this fact with greater and greater clearness .

The state of being free from obscurities or opacity; distinctness of light, colour etc.

:The clearness of the water meant I could still see the key lying on the river-bed.

The state of being free from obstruction or interference.

:The clearness of the path made for an easy hike.

Noun

(wikipedia simplicity)

The quality or state of being simple, unmixed, or uncompounded; as, the simplicity of metals or of earths.

The quality or state of being not complex, or of consisting of few parts; as, the simplicity of a machine.

Artlessness of mind; freedom from cunning or duplicity; lack of acuteness and sagacity.

Freedom from artificial ornament, pretentious style, or luxury; plainness; as, simplicity of dress, of style, or of language; simplicity of diet; simplicity of life.

Freedom from subtlety or abstruseness; clearness; as, the simplicity of a doctrine; the simplicity of an explanation or a demonstration.

Freedom from complication; efficiency.

*{{quote-magazine, date=2013-08-03, volume=408, issue=8847, magazine=(The Economist)

, title= Boundary problems , passage=Economics is a messy discipline: too fluid to be a science, too rigorous to be an art. Perhaps it is fitting that economists’ most-used metric, gross domestic product (GDP), is a tangle too. GDP measures the total value of output in an economic territory. Its apparent simplicity explains why it is scrutinised down to tenths of a percentage point every month.}}

Weakness of intellect; silliness; folly.

(rare) An act or instance of foolishness.

*, II.31:

*:speaking of the great simplicity we commit, in leaving yong children under the government and charge of their fathers and parents.