What is the meaning of regrets?

noun

• Sadness associated with some wrong done or some disappointment.
  • usage: "he drank to drown his sorrows"; "he wrote a note expressing his regret"; "to his rue, the error cost him the game"
  • synonyms: sorrow, regret, rue, ruefulness
• A polite refusal of an invitation.
  • synonyms: declination

verb

• Feel remorse for; feel sorry for; be contrite about.
  • synonyms: repent, regret, rue
• Feel sad about the loss or absence of.
  • synonyms: regret
• Decline formally or politely.
  • usage: "I regret I can't come to the party"
  • synonyms: regret
• Express with regret.
  • usage: "I regret to say that you did not gain admission to Harvard"
  • synonyms: regret