Frown

A facial expression in which the eyebrows draw together or downward, often signaling displeasure, concentration, or concern.

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Corrugator supercilii muscle: A facial muscle that draws the eyebrows inward and downward. Its contraction creates the knitted-brow shape central to many frowns.
Nonverbal communication: Communication through behavior and signals other than spoken or written language. A frown can convey a reaction without an explicit verbal statement.
Smile: A facial expression often involving raised mouth corners and associated with friendliness or pleasure. Its typical mouth shape contrasts with the downward or tightened features of a frown.
Botulinum toxin: A neurotoxic protein used in controlled medical and cosmetic treatments to reduce muscle activity. Injections can temporarily weaken muscles involved in frown lines.
Procerus muscle: A facial muscle that pulls the skin between the eyebrows downward. It deepens the vertical lines often formed during a frown.
Disgust: An emotion involving aversion, often accompanied by characteristic facial and bodily responses. Some frowns accompany disgust, though a frown alone does not establish it.
Scowl: A facial expression with a strongly furrowed brow and often a tense or hostile appearance. A scowl is usually more intense and anger-associated than the broader category of frowns.
Glabellar lines: Vertical skin creases between the eyebrows, often made more visible by repeated brow contraction. Repeated frowning can deepen these lines over time.
Facial expression: A visible movement or configuration of the face that can convey emotion or social information. A frown is one recognizable configuration within this broader class.
Anger: An emotion associated with perceived obstruction, offense, or threat and often expressed through facial and bodily changes. A lowered, knitted brow can be one visible sign of anger.