Without a curb or curbs; lacking edges or boundaries that would typically restrain or limit.
From 'curb' plus the suffix '-less' (without). The suffix '-less' is highly productive in English for creating adjectives meaning the absence of something.
Modern urban design sometimes eliminates curbs to create 'curbless' streets that are safer and more accessible—this shows how old words get new relevance when city planners rethink what we've always assumed was necessary.
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