Indevotional is an adjective that describes something lacking in spiritual or religious devotion. There are several synonyms that can be used to express a similar meaning, such as irreligious, atheistic, non-devout, ungodly, profane, and secular. Irreligious and atheistic imply a complete lack of belief in a higher power or religious practice, whereas non-devout and ungodly suggest a more casual or apathetic approach to religion. Profane refers to something that is disrespectful or blasphemous toward religion or religious beliefs. Finally, secular suggests a focus on earthly concerns rather than spiritual matters. All of these synonyms can be used interchangeably with indevotional depending on the context.