Perspicacious

[Tina]

Having the power of seeing clearly; quick-sighted;
sharp of sight.

[Britney]

Adjective.

(serious usage) used to describe someone that is observant, it means to see through, or see clearly. Someone who is descibed as [perspicacious] understands what they observe and usually sees through the lies and facades that others use to hide behind.
(common usage) Generally this word is used when one wishes to sound like [a know-it-all], or used sarcastically to describe someone who acts like a know-it-all.

Common words used with this: [Pompous windbag]

[Sarah]

quick in noticing, understanding, or judging things accurately: