sorry

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Feeling or expressing sorrow.
• adjective Feeling or expressing sympathy or pity.
• adjective Feeling or expressing regret.
• adjective Worthless or inferior; paltry.
• adjective Causing sorrow, grief, or misfortune; grievous.

from The Century Dictionary.

• To sorrow; grieve.
• Feeling sorrow; grieved; sorrowful; unhappy; sad; pained; especially, feeling repentance or regret: noting either deep or slight, prolonged or transient, emotion.
• Causing sorrow; painful; grievous; mournful.
• Associated with sorrow; suggestive of grief or suffering; melancholy; dismal.
• Vile; wretched; worthless; mean; paltry; poor.
• Synonyms Vexed, chagrined.
• Pitiful, shabby.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Grieved for the loss of some good; pained for some evil; feeling regret; -- now generally used to express light grief or affliction, but formerly often used to express deeper feeling.
• adjective Melancholy; dismal; gloomy; mournful.
• adjective Poor; mean; worthless.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of a person Regretful for an action; grieved or saddened, especially by the loss of something or someone.
• adjective Poor, sad or regrettable.
• interjection Expresses regret, remorse, or sorrow.
• interjection Used as a request for someone to repeat something not heard or understood clearly.
• noun The act of saying sorry; an apology.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective causing dejection
• adjective feeling or expressing regret or sorrow or a sense of loss over something done or undone
• adjective bad; unfortunate
• adjective without merit