Here are examples of the word/phrase "stouthearted" used in a sentence and paraphrased in a sentence...
For her to enter that abandoned building the way she did was nothing less than stouthearted.
For her to enter that abandoned building the way she did was nothing less than fearless.
She risked a lot in a stouthearted attempt to gain fame.
She risked a lot in a brave attempt to gain fame.
Other Examples...