Here are examples of the word/phrase "courageness" used in a sentence and paraphrased in a sentence...
Despite how dark the environment was, the children still had a lot of courageness within them.
Despite how dark the environment was, the children still had a lot of valiantness within them.
The lieutenant's courageness is one of his greatest qualities.
The lieutenant's bravery is one of his greatest qualities.
Other Examples...