ETYM Latin insuperabilis: cf. Old Fren. insuperable. Related to In- not, and Superable.
1. Impossible to surmount; SYN. insurmountable.
2. Incapable of being surmounted or excelled; SYN. unconquerable.
ETYM French intolérable, Latin intolerabilis. Related to In- not, and Tolerable.
1. Completely unacceptable.
2. Impossible to tolerate or endure.