Without a filter (e.g., a cigarette). / Having not been filtered (e.g., coffee grounds). / (by extension) unrestrained, unrestricted, frank

Third-person singular simple present indicative form of unfilter

(computing, data) The lack or absence of a filter / (informal) A filterless cigarette

present participle of unfilter

(transitive) To undo the filtering of (data, etc.), or remove a filter from.