In reply to:

"robustious," a much older adjective that meant both "robust" and "boisterous."



Thanks, Jackie. I made an incorrect assumption based on the above that robustious was an old and defunct term.

Well, I can now use robustious robustiously.

P.S. After reading your post, I checked Onelook, and, sure enough, there on the MW link was robustious, well, alive and kickin'.