imponderable
adj
of which the effect or importance cannot be measured or estimated (作用或重要性)无法衡量的, 无法估计的. imponderable, n (usu pl 通常作复数) thing, eg a quality or an emotion, that is imponderable 无法估量的事物(如性质或感情)
the great imponderables of love and power 爱情与权力, 极难衡量的事物.