Free from filth; clean and uncontaminated; not dirty or morally corrupt.
From filth (Old English fylþ) + -less (Old English suffix meaning without or lacking). The -less suffix has been productive in English for over 1,000 years, creating opposites by indicating absence of a quality.
The -less suffix is English's way of creating opposites: filthy becomes filthless, helpless means without help, and homeless means without a home. It's like a linguistic off-switch that works on almost any noun!
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