Without folds or creases; smooth and unfolded, or unable to be folded.
From 'fold' plus the negative suffix '-less,' meaning 'without folds.' This is a straightforward English construction.
Foldless fabric technology is becoming big in fashion and aerospace—materials that resist creasing save time on ironing and make clothes last longer, which is why researchers are excited about it.
Complete word intelligence in one call. Free tier — 50 lookups/day.