Beetle browed is an idiom that describes a person with an angry or severe expression, followed by a heavy brow ridge. People with this type of brow often look like they are scowling or frowning. If you are on the lookout for synonyms of beetle browed then there are many options. Some of the common synonyms of beetle browed are scowling, glowering, frowning, scowly, angry, severe, stern, and sullen. All these words refer to someone who appears unhappy, angry, or disapproving. Additionally, some other words that could describe someone's expression include menacing, grim-faced, dark, and brooding.