Childhood depression is persistent sadness.

Difficulties regulating emotions, including symptoms such as persistent sadness, suicidal thoughts, explosive anger, or covert anger.

Depression is an illness marked by persistent sadness, feelings of hopelessness, and a pessimistic outlook.

Symptoms are persistent sadness, sleep problems, insomnia, feelings of guilt, loss of interest and energy, and more.

Depression in children and teens is reflected in a persistent sadness or negativity that interferes with social activities, interests, schoolwork, personal appearance, and family life.

Many people assume that depression is easily identifiable, manifesting itself as persistent sadness that doesn't lift.

Dietz diagnosed Hinckley with personality disorders: narcissistic, schizoid, and a mixed personality disorder with passive-aggressive and borderline traits, plus persistent sadness.

But for all her animus and showmanship, the film has a dark, claustrophobic aura that locks viewers inside with the old woman's persistent sadness.

Psychiatrists define depression as an affective disorder characterized by a profound and persistent sadness.

Classic signs include persistent sadness, withdrawal from activities once enjoyed, difficulty sleeping and concentrating, and poor appetite.