Perspicacity (noun)

1. The quality of being able to understand things clearly and quickly; keen insight.
2. The ability to see through and grasp the true nature of things.

Origin:

The word "perspicacity" comes from the latin word "perspicere" meaning "to see through" and was first used in english in the 18th century.

Examples:

1. The detective was known for his perspicacity and ability to solve complex cases.
2. His perspicacity allowed him to see through the lies and reveal the truth.
3. The decision was made with remarkable perspicacity.
4. Her perspicacity was highly valued in the company.
5. His perspicacity allowed him to see the underlying motives of the people around him.