How to say 'It's not good' or 'no good' in Korean?
(informally) towards close friends or family

ex) Those foods are bad for you.
That(the food) is no good for you.

Question

How to say 'It's not good' or 'no good' in Korean?
(informally) towards close friends or family

ex) Those foods are bad for you.
      That(the food) is no good for you.

Answer

(informally) towards close friends or family
안 좋아요 is very formal.  And 별로네요~ 별로예요~ 별로야~ are informal.

ex) Those foods are bad for you. 그 음식들은 너에겐 별로야~
That(the food) is no good for you. 그건 너에겐 별로야~