1. unfilter - Noun
2. unfilter - Verb
unfilter (third-person singular simple present unfilters, present participle unfiltering, simple past and past participle unfiltered)
(transitive) To undo the filtering of (data, etc.), or remove a filter from.
(computing, data) The lack or absence of a filter
(informal) A filterless cigarette
Source: en.wiktionary.org