English Translation
You must be careful not to make him angry.
This sentence has been changed on Tatoeba. First, the spelling θυμομένος is non-standard, with θυμωμένος the better form. And the better way to say ‘be careful not to make him angry’ is ‘ Πρέπει να προσέχεις να μην τον κάνεις να θυμώσει.’