你相信他真是太愚蠢了。

It is stupid of you to believe in him.

Source: Tatoeba

Sentence Composition

=1 you (informal, as opposed to courteous nín)
=1 you (Note: In Taiwan, is used to address females, but in mainland China, it is not commonly used. Instead, is used to address both males and females.)
2 相信 xiāngxìn to believe; to be convinced; to accept as true
3
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 and 他人 rén)
=4 真是 zhēnshi
  1. indeed; truly
  2. (coll.) (used to express disapproval, annoyance etc)
=4 真是 zhēnshì
  1. (colloquial) Used to express dissatisfaction or annoyance; honestly!
  2. Used other than figuratively or idiomatically: see (zhēn), (shì): (it) really is; (it) truly is
  3. Used to express dissatisfaction or annoyance; honestly!
=5 tài
  1. highest
  2. greatest
  3. too (much)
  4. very
  5. extremely
=5
  1. (Korean Classical Chinese) soybean
  2. (obsolete on its own in Standard Chinese) only used in 太末
  3. only used in 太末
  4. soybean
6 愚蠢 chǔn
  1. silly
  2. stupid
=7 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)
=7 liǎo
  1. to finish
  2. (used with or after a verb to express (im)possibility, as in 忘不了 wàngbuliǎo "cannot forget")
  3. (literary) (usually followed by a negative such as or ) completely (not); entirely (not); (not) in the least
  4. to understand clearly (variant of liǎo)
=7 liǎo
  1. (of eyes) bright
  2. clear-sighted
  3. to understand clearly
=7 liào unofficial variant of liào