一堪りもなく[hitotamarimonaku] easily
堪える[koraeru] to bear
堪えかねる[taekaneru] to be unable to endure
堪らない[tamaranai] intolerable
堪忍[kannin] pardon

堪忍袋の緒が切れる[kanninbukuronoogakireru] to be out of patience
堪能[tannou] proficient
持堪える[mochikotaeru] to hold out (e.g. against pressure)
堪え忍ぶ[taeshinobu] to put up with
堪え難い[taegatai] unbearable