Here are examples of the word/phrase "intrepidness" used in a sentence and paraphrased in a sentence...
He may seem timid and weak, but his intrepidness is astronomical.
He may seem timid and weak, but his valiancy is astronomical.
That empire is full of intrepidness because all its' soldiers are willing to die for it.
That empire is full of braveness because all its' soldiers are willing to die for it.
Other Examples...