General Synonyms:
* Scowled: This is a very common synonym, implying a harsh and angry expression.
* Frowned: Less intense than scowling, but still indicating disapproval or displeasure.
* Stared: Can imply a harsh or angry look, especially if the context is negative.
* Looked daggers: A more figurative way of saying someone was glaring intensely.
* Lowered: This is a more neutral term that simply implies a lowering of the brows.
More Specific Synonyms:
* Glared: Stronger and more intense than scowling, suggesting fierce anger.
* Snarled: Implies a more aggressive and threatening expression, often accompanied by a growl.
* Frowned fiercely: Stronger than simply frowning, implying a significant level of displeasure.
* Fixed a withering look: A particularly scornful or contemptuous gaze.
* Burned with anger: A figurative expression that emphasizes the intensity of the anger.
The best synonym for "glowered" will depend on the specific context and the desired effect.