Questions about example sentences with, and the definition and usage of "Overemphasized"

A: It means someone is being too specific, giving more details or information than is necessary to explain something.
"My favorite teacher is kind, nice, and good" this sentence overemphasizes the same thing. Overemphasize may also refer to when you speak and put more emphasis on a part of a word. "The boy is running. No, the boy is runnING"

A: "I refuse to overemphasize." You can use "ed" when you are talking about past tense, but when you are talking about right now, you don't used "ed", if that makes sense.