look bad.
The German phrase 'schlecht aussehen' is used to express that someone or something looks bad or unappealing. It is a direct translation of the English phrase 'look bad'. This phrase can be used in a variety of contexts, such as describing someone's appearance, a situation, or an object.
You should rest, you look very bad.
This sentence uses 'du siehst sehr schlecht aus' to tell someone directly that they don't look well. This is often used concernedly in contexts when someone might be sick or exhausted.
It is not fair to say that all modern artworks look bad.
In this sentence, 'schlecht aussehen' is used to express a negative opinion about the appearance of modern artworks. Note that 'all' here refers to a general classification, not specifically every individual piece of modern art.
I probably look bad after the long flight.
Here, 'ich sehe wahrscheinlich schlecht aus' is used by the speaker to make an assumption about their own appearance. It's likely used in a context where the speaker is acknowledging the physical toll a long flight might have had on them.