If you describe a study, search, or list as exhaustive, you mean that it is very thorough and complete.

What does it mean if something is exhaustive?

: including all possibilities : thorough conducted an exhaustive search.

What is the synonym of exhaustive?

1'an exhaustive study of the subject' comprehensive, all-inclusive, complete, full, full-scale, all-embracing, all-encompassing, encyclopedic, thorough, in-depth, thoroughgoing, extensive, intensive, all-out, profound, far-reaching, sweeping, umbrella.