im·pon·der·a·ble 
/ɪmˈpɑ:ndərəbəl/ adjective
/ɪmˈpɑ:ndərəbəl/ adjective formal : not able to be measured or judged exactly
▪ the imponderable vastness of space
▪ the imponderable vastness of space
— imponderable noun, plural imponderables [count]
▪ the imponderables of human nature [=the mysteries of human nature; the questions about human nature that cannot be fully answered or understood]
▪ the imponderables of human nature [=the mysteries of human nature; the questions about human nature that cannot be fully answered or understood]
