Indigestibly means something that cannot be digested, easily assimilated, or understood. Some synonyms of indigestibly are incomprehensible, unintelligible, unfathomable, impenetrable, obscure, convoluted, complicated, complex and difficult. These words refer to something that is too complicated or unclear to be easily understood, grasped, or processed. Indigestible can also refer to food that is tough, fibrous, or contains a lot of insoluble fiber. Some synonyms of indigestible in this sense are inedible, chewy, leathery, tough and unpalatable. In short, indigestibly is a term that can be applied to a wide range of things that are hard to swallow, digest or comprehend.