4 adjectives to describe ethnologists

That the Indians of the United States have directly and positively degenerated in moral sense as a race, since the introduction of Christianity, was also very decidedly the opinion of the late Prof. Theodor Waitz, a most competent ethnologist.

The mystic rites of the Pueblo Indians, performed at Pueblo de Taos in honor of San Geronimo (St. Jerome), upon each succeeding 30th day of September, attract large concourses of people, and are of great interest to either the ethnologist, ecclesiastic or tourist.

It is a patriotic and scientific enterprise, conceived and undertaken by the late Dr. Artur Hazelius, an eminent ethnologist, for the purpose of preserving the habits and customs of the Scandinavian races.

I am no politician, no learned ethnologist, no sage theorist.

4 adjectives to describe  ethnologists