PERSPICACIOUS(adjective): Being able to grasp and understand difficult or obscure concepts.
Synonyms- Alert, Aware, Insightful, Discerning, Astute, Sharp-witted, Clever, Acute
Antonyms- Ignorant, Unobservant, Oblivious, Dense, Obtuse, Inattentive, Dull-witted
Sentence usage – The Perspicacious student quickly grasped the complex concepts.
Phrase- Sharp as a tack, It implies someone who is exceptionally intelligent.
Idiom- Quick on the Uptake, conveys the idea of being quick to understand or comprehend something.