3 Metaphors for acute

So acute is their power of discrimination, that they have been known to trace the footsteps of bush-rangers over mountains and rocks; and, although the individual they have been in pursuit of has walked into the sides of the river as if to cross it, to elude the vigilance of his pursuers, and has swam some distance down and crossed when convenient, yet nothing can deceive them.

So acute was his sense of honor, so delicate his ideas of propriety, that, although himself the most generous of men, he never would accept from acquaintances the slightest favors or courtesies which he was unable to return.

He was amazed at the continual noise it made, and the motion of the minute-hand, which he could easily discern; for their sight is much more acute than ours: and asked the opinions of his learned men about him, which were various and remote, as the reader may well imagine without my repeating; although, indeed, I could not perfectly understand them.

3 Metaphors for  acute