This is the 17842nd most frequent Polish word.
zły
Bad; angry.
Here, 'zły' describes the quality of the movie, meaning 'bad'.
Ten film był bardzo zły.
This movie was very bad.
In this context, 'zły' expresses the emotion of being angry.
Nie bądź zły na mnie.
Don't be angry with me.
Here, 'zły' characterizes the dog as aggressive or malevolent.