名詞 profundity:

1. wisdom that is recondite and abstruse and profound
   同義詞：reconditeness, abstruseness, abstrusity, profoundness
2. intellectual depth; penetrating knowledge; keen insight; etc
   同義詞：profoundness
3. the intellectual ability to penetrate deeply into ideas
   同義詞：astuteness, profoundness, depth, deepness
4. the quality of being physically deep
   同義詞：deepness, profoundness

1. He impress his audience by the profundity of his knowledge.
   他知識淵博給聽眾留下了深刻的印象。
2. He impressed his audience by the profundity of his knowledge.
   他知識淵博給聽眾留下了深刻的印象。

pro.fun.di.ty

n.（名詞）
【復數】 pro.fun.di.ties
Great depth.
深處：很深
Depth of intellect, feeling, or meaning.
深奧：知識、感情或意義的深處
Something profound or abstruse.
深奧的事情：深奧的或復雜的事物

來源：
Middle English profundite
中古英語 profundite
from Old French
源自 古法語
from Late Latin profundit3s
源自 后期拉丁語 profundit3s
from Latin profundus [deep] * see profound
源自 拉丁語 profundus [深的] *參見 profound