* Adjective: Describing something that is not visible.
* Example: "The unseen danger lurked in the shadows."
* Past participle: Used as an adjective or part of a verb phrase.
* Example: "I have unseen the error of my ways." (adjective)
* Example: "He had unseen the potential of the project." (part of a verb phrase)
The specific part of speech depends on the context in which it is used.