bravado \bruh-VAH-doh\ noun
Meaning
1 a : blustering swaggering conduct b : a pretense of bravery
*2 : the quality or state of being foolhardy

"You rarely see a kitten attempt to take on anything that much bigger than itself," said Jerry, whilst cleaning up the stray lettuce leaves and milk.
"Well, he certainly has guts," replied Michelle, who was wiping down Greg's shell.
"Bravado is what that kitten has," said Jerry. "I think we raised an alley cat."
"I told you we should have gone for pedigree." She looked down at Greg. "I don't know if he'll come out for a week."
"Perhaps he's hibernating?"
"Not for another three months."
"Well, maybe we'll have him for Christmas this year then. I always wanted a tortoise Father Christmas."