Indagate is an uncommon word, often used in legal or academic contexts to mean an investigation or inquiry. Synonyms for indagate include investigate, inquire, scrutinize, probe, examine, research, explore, delve, analyze, and audit. Each of these synonyms carries a slightly different connotation, with investigate and inquire suggesting a more general questioning of a situation, while scrutinize and probe suggest a closer examination or more intense questioning. Explore and delve suggest a more thorough investigation, while audit and analyze suggest a more structured and detailed approach. Each synonym can be used in place of indagate depending on the intended meaning and tone of the sentence.