1. Pertaining to an individual who possesses or demonstrates penetrating mental discernment; clear-sighted: Mike always thought his mother was a perspicacious judge of character.
2. Regarding someone having or showing an ability to notice and to understand things that are difficult or not obvious: The movie critic made some perspicacious observations about the film.

1. Descriptive of something which is clearly expressed or stated; easy to understand: As an author and a speaker, Bert's written documentations were always very perspicuous and presented much vivid information.
2. Characterizing someone who expresses himself or herself clearly and effectively: The professor was known as a perspicuous lecturer who could explain topics exceedingly well.