Without a bib; not wearing or having a bib.
From 'bib' (a cloth worn to protect clothing) plus the suffix '-less' (without). Both elements are relatively modern, with 'bib' appearing in English around the 16th century, likely from baby-talk origins.
This humble word shows how creative English speakers can be—once we had the word 'bib,' we could instantly create its opposite. It's the same pattern that gives us 'homeless,' 'hopeless,' and 'hatless.'
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