glowering
Concise Oxford English Dictionary © 2008 Oxford University Press:
glower /ˈglaʊə/
▶verb have an angry or sullen look on one's face; scowl. ▶noun an angry or sullen look.
– derivatives
glowering adjective,
gloweringly adverb.
glowering adjective,
gloweringly adverb.
– origin C15: perh. a Scots var. of dial. glore, or from obs. glow ‘to stare’, both possibly of Scand. origin.
'glowering' also found in these Oxford entries:

