— loweringly , adv.
/low"euhr ing, loweur"ing/ , adj.
1. dark and threatening, as the sky, clouds, or weather; overcast; gloomy: lowering skies.
2. frowning or sullen, as the face or gaze; scowling; angry.
Also, louring .
[ 1300-50; ME louring. See LOWER 2 , -ING 2 ]