This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. With the power of seeing or understanding clearly; quick-sightedly; with sharp of sight.

ad. With acute discernment; keenly; with mental perception.

In a perspicacious manner; with quick discernment.

"It is better, Professor Roberts perspicaciously suggests, to make Social Security and Medicare a safety net program for the people who really need it, and let richer Americans who can afford it handle their own retirements."

perspicacious    perspicuous    perspicacity    perspicuousness    perspective