く form of たい form of a verb I am listening to a song and I came across the sentence, > **** . What does the -form of the form of a verb turn into? In other words, what is ? Is it a noun? Or does it stay a verb? And what is the purpose of turning it into the form? And for those interested, the song is pretender by official dism.

A verb modified with behaves just like an i-adjective. So is just the standard negation: "I don't want to understand".

To understand what difference adding makes, see this link.