The word 'wall-less' means that there are no walls present. Antonyms for 'wall-less' would include words such as 'wall', 'enclosed', 'fenced', 'barriered', 'barricaded', 'contained', 'confining', 'restricted', and 'bounded'. These words all suggest that there are physical barriers or limits in place, whereas 'wall-less' implies the absence of such. The antonyms for 'wall-less' are useful when describing places or things that are secure, safe, and well-protected. It is essential to have a solid understanding of these antonyms to ensure that your writing is clear, concise, and effective in conveying the intended message.