Catechistic is a term that pertains to a specific teaching or instruction, usually related to religious doctrines. Antonyms for this word include non-instructive, non-educational, unenlightening, and nonsensical. Non-instructive refers to something that does not provide knowledge or information, while non-educational is the lack of information for academic purposes. Unenlightening pertains to something that fails to bring knowledge, and nonsensical relates to the lack of logic or reason in information. Overall, these antonyms contrast with catechistic, which is designed to provide significant instruction or teaching about religious matters.