unglowing

adjective2

1. •
   Not emitting a glow of light.

   • It came at last with a mother-of-pearl sheen at the zenith, such as I had never seen before in the tropics, unglowing, almost grey, with a strange reminder of high latitudes. — 1916
2. •
   Not conveying praise.

   • Is it acceptable to share “good letters” but never share letters with neutral or unglowing commentary? — 2002