形容詞 perspicacious:

1. acutely insightful and wise
   同義詞：sagacious, sapient
2. mentally acute or penetratingly discerning
   同義詞：clear-eyed, clear-sighted

1. It is very perspicacious of you to find the cause of the trouble so quickly.
   你真是明察秋毫，問題的原因這麼快就找出來了。

per.spi.ca.cious

adj.（形容詞）
Having or showing penetrating mental discernment; clear-sighted.See Synonyms at shrewd
敏銳的，聰穎的：具有或表現(xiàn)出看透人心理的洞察力的；眼光銳利的參見 shrewd

來源：
From Latin perspic3x perspic3c-
源自 拉丁語 perspic3x perspic3c-
from perspicere [to look through] * see perspective
源自 perspicere [看穿，看透] *參見 perspective

【引伸】
per.spica.ciously
adv.（副詞）
per.spica.ciousness
n.（名詞）