protean - PRO-tee-an - versatile, able to change
Example: "It appears unlikely so far that protean activity might occur during the stalemate in Iran."
As a starter: and as a former teacher in English, I hope to add to reader's vocabulary by presenting a word a day in simple terms that anyone can understand - from current use in publications, radio,TV, etc. Remember: use a new word three times in a day and it's yours forever!