Without bullets; not armed with or containing bullets, or lacking the main point or essence of something.
From 'bullet' plus the suffix '-less' (meaning without). The '-less' suffix comes from Old English and creates adjectives meaning the absence of something.
The '-less' suffix is one of English's most productive tools for negation, and 'bulletless' might be the only word that lets you poetically describe a gun without ammunition!
Complete word intelligence in one call. Free tier — 50 lookups/day.