Definition of protean:
changeable (part of speech: adjective)
- "A Morning's Walk from London to Kew", Richard Phillips.
- "Autobiography and Selected Essays", Thomas Henry Huxley.
They say that the Spirit guides them, and it would be unfair to disbelieve them, but the historian who should investigate conditions like these would lose his head in the labyrinth unless he made a separate study of each of these Protean movements.- "Life of St. Francis of Assisi", Paul Sabatier.