Appearances are deceitful.是什么意思？

Appearances are deceitful.

人不可貌相,海水不可斗量

appearances

n. 出现( appearance的名词复数 )，外观，[复数]（事物的）表面，[哲学]现象；

例句
Keegan made 68 appearances in two seasons for Southampton, scoring 37 times.
基冈为南安普敦队踢了两个赛季，共上场68次，进球37个。

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

deceitful

adj. 不诚实的，骗人的；adv. 惯于欺骗地，不诚实地；

例句
The ambassador called the report deceitful and misleading.
大使指称那份报告具有欺骗性和误导性。