regret
noun
sadness associated with some wrong done or some disappointment
“he drank to drown his sorrows”
“he wrote a note expressing his regret”
verb
feel remorse for; feel sorry for; be contrite about
feel sad about the loss or absence of
decline formally or politely
“I regret I can't come to the party”
express with regret
“I regret to say that you did not gain admission to Harvard”
Source: WordNet 3.1, Princeton University
