你看上去不太好。

You don't look so well.

You seem to be a little under the weather.

Source: Tatoeba

Sentence Composition

=1 你 nǐ you (informal, as opposed to courteous 您 nín)
=1 你 nǐ you (Note: In Taiwan, 妳 is used to address females, but in mainland China, it is not commonly used. Instead, 你 is used to address both males and females.)
=2 看上去 kànshangqu
  1. it would appear
  2. it seems (that)
=2 看上去 kànshàngqù
  1. to look and perceive
  2. to seem as if; to appear
3 不太好 bùtàihǎo
  1. not so good
  2. not too well