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Information about seasonal affective disorder (SAD), a type of depression, including signs and symptoms, how SAD is diagnosed, causes, and treatment options.

The meaning of SAD is affected with or expressive of grief or unhappiness : downcast. How to use sad in a sentence.

SAD definition: 1. unhappy or sorry: 2. If something looks sad, it looks worse than it should because it is not…. Learn more.

Synonyms for SAD: unhappy, heartbroken, depressed, miserable, sorry, bad, melancholy, upset; Antonyms of SAD: happy, glad, joyous, joyful, cheerful, cheery, jubilant, ecstatic

Melatonin, a sleep-related hormone, also may be linked to SAD. Symptoms can include increased sleep and daytime drowsiness, social withdrawal, grouchiness, and decreased sex drive.

SAD meaning: 1 : not happy feeling or showing grief or unhappiness; 2 : causing a feeling of grief or unhappiness

If you describe someone as sad, you do not have any respect for them and think their behaviour or ideas are ridiculous.

Nov 25, 2025 · sad (third-person singular simple present sads, present participle sadding, simple past and past participle sadded) (transitive, archaic) To make melancholy; to sadden or grieve (someone). …

SAD meaning: 1. unhappy or making you feel unhappy: 2. not pleasant or satisfactory: 3. boring or not…. Learn more.