Translation guide
A person or thing that appears threatening but is actually weak or ineffectual.
Describing someone or something that looks strong or dangerous but is not.
張子の虎 is the most direct translation and is widely recognized. It can be used in both spoken and written Japanese.
張子の虎 specifically implies a false threat, while 見かけ倒し is broader and can refer to anything that disappoints in quality or ability compared to its appearance.
That company turned out to be a paper tiger.
Proverb meaning 'a fox borrowing the tiger's authority', i.e., someone who bullies others by relying on a stronger power. More about borrowed authority than inherent weakness.
He's nothing but a paper tiger, relying on his boss's authority.