sightliness

From sightly +‎ -ness.

sightliness (uncountable)

1. The state or condition of being sightly; attractiveness, beauty.
   • 1748, [Samuel Richardson], “Letter XLI”, in Clarissa. Or, The History of a Young Lady: […], volume I, London: […] S[amuel] Richardson;  […], →OCLC, pages 280–281:

     Your ſightlineſs of perſon, may perhaps make ſome think this alliance diſparaging.

• insightless