Without foam or froth; lacking in bubbles or a frothy surface.
From 'foam' + '-less' (suffix meaning without), following the ancient and productive English pattern of using '-less' to negate or express absence.
The '-less' suffix is the opposite of '-ful'—it's been in English since Anglo-Saxon times and remains wildly productive, allowing speakers to instantly create negations like 'shameless,' 'homeless,' or 'foamless' that everyone understands.
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