regret

[1]	rue , mourn , lament , bemoan , bewail , repent , be/feel sorry for , feel remorse for , feel/be remorseful over , be/feel upset , never forgive oneself , deplore , deprecate , weep/cry over
[2]	repent , rue

[1]	sorrow , rue , ruefulness
[2]	regrets , repentance , guilt , sorrow , disappointment , contrition , remorse , regretfulness , (pang/pangs of) conscience , self-reproach , self-condemnation , qualm , second thoughts , rue , ruefulness , grief , woe , sadness , mournfulness , (Literary) dolour
[3]	regrets , refusal , non-acceptance , non-consent , (US) turn-down