sorrow, regret, rue, ruefulness -- (sadness associated with some wrong done or some disappointment; "he drank to drown his sorrows"; "he wrote a note expressing his regret"; "to his rue, the error cost him the game")
Overview of verb regret
The verb regret has 4 senses
repent, regret, rue -- (feel remorse for; feel sorry for; be contrite about)
regret -- (feel sad about the loss or absence of)
regret -- (decline formally or politely; "I regret I can't come to the party")
regret -- (express with regret; "I regret to say that you did not gain admission to Harvard")
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