Insupportable/ˌɪnsəˈpɔːrtəbl/ Definition 1 of 2Pro Tip 1/3Emotional Weight Used to express strong negative emotions about situations or experiences. The insupportable sadness after losing her pet lingered for months. Pro Tip 2/3Not Always Literal Sometimes used figuratively to describe situations that are very difficult, not only physically. The wait for exam results was insupportable. Pro Tip 3/3Extreme Conditions Often describes extreme physical conditions that are hard to withstand. The insupportable heatwave caused widespread discomfort.