Beetle-browed is a term used to describe someone who has a frowning, dark, or brooding expression. It is usually associated with a person who looks angry, sulky, or unhappy. The antonyms of the word beetle-browed would be opposite in meaning, such as smiling, cheerful, happy, and bright-faced. These words can be used to describe someone who has a pleasant expression, radiates optimism, and exudes positivity. Someone who is friendly, approachable, and has a sunny disposition can be considered as an antonym for the beetle-browed person. The word beetle-browed itself suggests negativity, and it is always better to have antonyms that are positive instead of negative.