"All bones" is a phrase that typically describes someone who is very thin and appears to lack any flesh or muscle. This phrase can also be altered using a variety of synonyms, depending on the tone and emphasis intended. Alternative phrases might include "skin and bones," "emaciated," "scrawny," "gaunt," "bony," or "skeletal." Each of these synonyms help to convey a similar sense of thinness, but with slightly different connotations. For instance, "emaciated" suggests a degree of malnourishment, while "scrawny" may suggest a person who is underdeveloped or weak. Ultimately, the choice of synonym depends on the context, audience, and authorial intentions.