The adjective exhaustive means something that is very thorough and complete.

Synonyms are encyclopedic, extensive, full-scale, or in-depth.

The word origins in 1780s. It comes from the verb exhaust meaning “to make someone extremely tired” plus -ive.

The writer is referred to that book for an exhaustive history and discussion of the study.

They didn’t continue the research because the work is exhaustive.

A feminist photographer made an exhaustive study of manspreading ever conducted.