Without grain; lacking a grain or grain-like pattern or texture; smooth.
From 'grain' plus the privative suffix '-less,' which means 'without' or 'lacking' (as in 'homeless,' 'hopeless').
Modern polished concrete and glass surfaces are grainless by design, but the human eye evolved to prefer texture—that's why designers are bringing back wood grain and subtle textures even in minimalist spaces.
Complete word intelligence in one call. Free tier — 50 lookups/day.