Insight and discernment are applied oftenest to the judgment of character; penetration and perspicacity to other subjects of knowledge. Perspicacity is the power to see clearly through that which is difficult or involved.

J. C. Fernald, English Synonyms and Antonyms (1914)

Example sentences

acumen It is obvious to me that he has no political acumen at all.
sagacity Tom isn't known for his sagacity.
shrewdness I am no match for him in diplomatic shrewdness.
judgment Yanni is going to face God on the Day of Judgment.

Popularity over time

Word	1850 → 2019	Trend
perspicacity		falling
acumen		steady
sagacity		steady
shrewdness		steady
astuteness		steady
judgment		falling

Use in printed books, per decade from 1850 to 2019.

By length

3 letters: wit¹
5 letters: depth¹
6 letters: wisdom², acumen³
7 letters: insight², antenna³
8 letters: judgment², prudence², subtlety³, keenness, sagacity
9 letters: judgement², sharpness², acuteness³
10 letters: shrewdness², astuteness³
11 letters: penetration⁴, discernment³
13 letters: sagaciousness

The small number after each word is its number of syllables (wisdom² = 2 syllables).

In other languages

Français: perspicacité
Italiano: perspicacia
Español: perspicacia
Deutsch: Scharfsinn
Català: perspicàcia