Without guests; lacking visitors or having no one as a guest.
From 'guest' plus the privative suffix '-less' (from Old English 'leas' meaning lacking). Creates an adjective meaning 'without' the named thing.
The '-less' suffix is one of English's most straightforward negating tools—it's productively applied to almost any noun ('homeless,' 'childless,' 'wireless'), making formations like 'guestless' immediately comprehensible even if rarely used in specific contexts.
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