To Regret
To Mourn, To Lament
transitive verb, godan verb
くやむ
悔やむ (くやむ) To Regret, To Mourn, To Lament
悔しい (くやしい) Regrettable, Vexing, Annoying
弔う (とむらう) To Mourn For, To Hold A Memorial Service For, To Condole
嘆く (なげく) To Lament, To Grieve
憂える (うれえる) To Be Anxious, To Worry About, To Lament, To Grieve, To Be Distressed
Cool く ya や dance moves む or you might Regret it.