dimmish

dim +‎ -ish

dimmish (comparative more dimmish, superlative most dimmish)

1. Somewhat dim.
   • 1907, Mark Twain, A Horse’s Tale, New York: Harper, Chapter 4, p. 28,

     […] there is a great shut-in meadow […] and as the sun goes down it is dimmish in there, but away up against the sky you see the big peaks towering up and shining bright and vivid in the sun […]

   • 1982, Lawrence Durrell, Constance, New York: Viking, Chapter Six, p. 144,

     The airport buildings were in darkness except for a few dimmish lights in the lounge.

Chambers's Etymological Dictionary, 1896, p. 126

• dhimmis