What literary device is the phrase hopeless romantic?

"Hopeless romantic" is not a single literary device, but rather a phrase. It is a colloquialism or idiom that describes a person who is overly idealistic and sentimental about love and relationships.

Here's why:

* Colloquialism: It's a casual, informal phrase that is commonly used in everyday speech.

* Idiom: It's a phrase whose meaning is not literal and cannot be deduced from the individual words.

While "hopeless romantic" itself isn't a literary device, it can be used within a literary work to characterize a character, create irony, or add humor.

For example, if a character is described as a "hopeless romantic" but constantly gets their heart broken, this creates irony.