に堪えない

に堪えない describes extreme inability to endure or tolerate a strong emotion, sensation, or situation. It is used when something provokes a feeling that one cannot withstand, often with a sense of emotional or physical strain. The subject is typically experiencing the emotion/sensation caused by the preceding element, expressed in the plain form or base noun. It can express sympathy, outrage, pain, or disgust, among others. The nuance is stronger than simply ‘unbearable’ and conveys an active struggle to endure.