"Free as air" is an idiom that represents the concept of complete freedom, ease, lack of worry, and independence. Some common synonyms for "free as air" are "footloose and fancy-free," "unfettered," "unrestrained," "uninhibited," "unburdened," "carefree," "unencumbered," "liberated," and "unconstrained." All these synonyms for "free as air" depict the idea of being unbound by any physical or emotional restraints and living life without any obligations or worries. Anyone who is experiencing all the above-mentioned states can be considered "free as air" and lead their life with a great sense of freedom and joy.