Maybe the complete definition is something like this:
What is a good-tempered person?
A good-tempered person has several qualities.
S/he is pleasant
S/he is kind
S/he is not easily made angry (by other people).
That is the passive; the active is:
Other people easily make her/him angry.
S/he is easily made angry by other people.
Add not for the negative.
Dictionaries have to save space. So they cannot give
For example, there are signs in some countries:
English spoken here.
That is short for "English is spoken here (by the people who
work at this store)."
****** NOT A TEACHER *****