The phrase "is loose" conveys the idea of something being free, unattached, or not secure. There are various synonyms for this phrase, including "unfastened," "undone," "unfixed," "unsecured," "unconfined," "unattached," "unglued," "unbolted," and "free. Each of these words connotes a sense of something being released or in an unstable state. Additionally, alternatives such as "wobbly" or "shaky" imply a lack of stability or a potential for danger. By using synonyms for "is loose," writers can add nuance to their descriptions and more effectively convey the precise meaning they intend.