Initialism of sudden arrhythmic death syndrome. / Initialism of sudden adult death syndrome. / Initialism of swine acute diarrhea syndrome.

(colloquial, only with definite article) Sadness or melancholy

plural of sad (the Arabic letter)

Third-person singular simple present indicative form of sad

plural of SAD

Feeling sorrow; sorrowful, mournful. / Appearing sorrowful. / Causing sorrow; lamentable. / Poor in quality, bad; shameful, deplorable; later, regrettable, poor.

(transitive, archaic) To make melancholy; to sadden or grieve (someone).

Alternative form of saad (“Arabic letter”)

(medicine) Initialism of seasonal affective disorder. / Initialism of standard American diet. / (US) Initialism of Special Activities Division. / (psychology) Initialism of social anxiety disorder.

(uncountable) The state or emotion of being sad. / (countable) An event in one's life that causes sadness.