Questions about example sentences with, and the definition and usage of "Nervy"

A: Ich bin nervös

A: nervy means edgy, dense, irritable, anxious, you can just replace the following words with nervy. It also means daring (in a bad or good way depending on the context) So with the context the meaning of the word changes.

Like say, "he's always on edge."
you can say "He always seems in a nervy state" /"You seem so nervy lately."

A: We have a similar expression, "I don't have the nerve to do it." or "...to do this."