semigloom

From semi- +‎ gloom.

semigloom (uncountable)

1. Partial gloom or darkness.
   • 1936 June 30, Margaret Mitchell, Gone with the Wind, New York, N.Y.: The Macmillan Company, →OCLC; republished New York, N.Y.: The Macmillan Company, 1944, →OCLC, part IV, page 367:

     The room was in semigloom, for Scarlett had pulled down the shades to shut out the heat and brightness.