1) An angry stare 2) Glare 3) Look angry 4) Look at with a fixed gaze 5) Look back in anger 6) Look daggers 7) Menacing look 8) Scowl 9) Stare 10) Stare angrily 11) Stare sullenly 12) Sullen look 13) Sullen stare Found on https://www.crosswordclues.com/clue/glower
Glow'er intransitive verb [ imperfect & past participle Glowered ; present participle & verbal noun Glowering .] [ Confer Gloar .] to look intently; to stare angrily or with a scowl. Thackeray. Found on http://www.encyclo.co.uk/webster/G/36