Definition of insupportable adjective from the Oxford Advanced Learner's Dictionary

 

insupportable

 adjective
adjective
BrE BrE//ˌɪnsəˈpɔːtəbl//
 
; NAmE NAmE//ˌɪnsəˈpɔːrtəbl//
 
 
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so bad or difficult that you cannot accept it or deal with it synonym intolerable Their debt had become an insupportable burden. Word Origin mid 16th cent.: from French, from in- ‘not’ + supportable (from supporter ‘to support’).
See the Oxford Advanced American Dictionary entry: insupportable