Sorry

Adjective

1. (of a person) Regretful or apologetic for an action.

Synonyms: apologetic, compunctious, contrite, penitent, regretful, remorseful, repentant

2. (of a person) Grieved or saddened, especially by the loss of something or someone.

Synonyms: heavy-hearted, melancholy, mournful

3. Poor, pitifully sad or regrettable.
4. Pathetic; contemptibly inadequate.

Interjection

1. Expresses regret, remorse, or sorrow. Synonym: (slang, chiefly Britain) soz
2. Used as a request for someone to repeat something not heard or understood clearly. Synonyms: I beg your pardon?, I'm sorry?, say again, come again, (US) excuse me?
3. Used to correct oneself in speech.