acuteness

His perception was still exceptionally alert, its acuteness left over, apparently, from the earlier days of pain and jealousy.

But I have enough mental acuteness to see that the religion of Jeremy Taylor was cowardly, and gloomy, and untrue.

Among the former are acuteness and quickness of vision, the power of grasping complex subjects, and a good memory.

Her loss of sight had been more than compensated by an extraordinary acuteness of mental vision.

That is the way of female intellects when they are good; nothing equals their acuteness, and their rapidity is almost excessive.