"Unnail" is a verb that refers to the act of removing a nail or nails from a surface. Synonyms for "unnail" include "remove", "extract", "detach", "pull out", "dislodge", and "take out". These synonyms can be used interchangeably depending on the context. For instance, if you want to describe the process of taking a nail out of a surface, you can use any of these words. They essentially convey the same meaning and allow you to diversify your vocabulary when discussing this specific action.