ETYM Latin acumen, from acuere to sharpen. Related to Acute.
Quickness of perception or discernment; penetration of mind; the faculty of nice discrimination.
Quickness to perceive; shrewdness.
The intellectual ability to penetrate deeply into ideas; SYN. profundity, profoundness, depth.
2. An instance of brilliance
ETYM Latin perspicacitas: cf. French perspicacité. Related to Perspicacious.
The state of being perspicacious; acuteness of sight or of intelligence; acute discernment.
ETYM Latin sagacitas. Related to Sagacious.
Ability to make good judgments; SYN. sagaciousness, judgment, judgement, discernment.