Definition of filterless in US English:

filterless

adjective

  • 1Lacking a filter; especially not fitted or used with a filter.

  • 2Designating a cigarette without a filter; of or relating to such a cigarette. Also occasionally as noun: a filterless cigarette.

Origin

Late 19th century; earliest use found in The Cedar Rapids Evening Gazette. From filter + -less.

Pronunciation

filterless

/ˈfɪltələs/