Meaning of sad

sad

1. affected by unhappiness or grief; sorrowful or mournful: to feel sad because a close friend has moved away.
2. expressive of or characterized by sorrow: sad looks; a sad song.
3. causing sorrow: a sad disappointment; sad news.
4. (of color) somber, dark, or dull; drab.
5. deplorably bad; sorry: a sad attempt.
6. firm or steadfast.

sād

1. the 14th letter of the Arabic alphabet.

SAD

1. seasonal affective disorder.