sorrow

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Mental suffering or pain caused by injury, loss, or despair. See Synonyms at regret.
2. n. A source or cause of sorrow; a misfortune.
3. n. Expression of sorrow; grieving.
4. v. To feel or express sorrow. See Synonyms at grieve.

Century Dictionary and Cyclopedia

1. n. Distress of mind caused by misfortune, injury, loss, disappointment, or the like; grief; misery; sadness; regret.
2. n. A cause or occasion of grief; a painful fact, event, or situation; a misfortune; a trouble.
3. n. The outward manifestation of grief; mourning; lamentation.
4. n. The devil: used generally as an expletive in imprecation, often implying negation. Compare devil, n., 7. Sometimes the muckle sorrow. Also spelled sorra.
5. n. Synonyms Grief, Wretchedness, etc. (see affliction), repentance, vexation, chagrin. See list under sadness.
6. To feel sorrow, sadness, regret, grief, or anguish; grieve; be sad; feel sorry.
7. To manifest sorrow; mourn; lament.
8. Synonyms To grieve, mourn. See sorrow, n.
9. To feel or display sorrow over; grieve for; mourn.
10. To give pain to; grieve.
11. To involve in sorrow; attach suffering or misery to.

Wiktionary

1. n. uncountable unhappiness, woe
2. n. countable (usually in plural) An instance or cause of unhappiness.
3. v. intransitive To feel or express grief.
4. v. transitive To feel grief over; to mourn, regret.

GNU Webster's 1913

1. n. The uneasiness or pain of mind which is produced by the loss of any good, real or supposed, or by diseappointment in the expectation of good; grief at having suffered or occasioned evil; regret; unhappiness; sadness.
2. v. To feel pain of mind in consequence of evil experienced, feared, or done; to grieve; to be sad; to be sorry.

WordNet 3.0

1. n. the state of being sad
2. v. feel grief
3. n. something that causes great unhappiness
4. n. sadness associated with some wrong done or some disappointment
5. n. an emotion of great sadness associated with loss or bereavement