adj. 25B6; adjective
the heat was insufferable : INTOLERABLE, unbearable, unendurable, insupportable, unacceptable, oppressive, overwhelming, overpowering; more than flesh and blood can stand; informal too much.
his win made him insufferable : CONCEITED, arrogant, boastful, cocky, cocksure, full of oneself, self-important, swollen-headed, swaggering; vain, self-satisfied, self-congratulatory, smug; informal big-headed, too big for one's boots; poetic/literary vainglorious.
bearable, modest.