More, Thompson, than you probably wish to know:

http://www.merriam-webster.com/grammar/purposely-purposefully-usage

Most interesting to me is the notion that many people don't think "purposely" is a "real word."

And here's my pet meta-peeve. Nearly everybody seems to think Trump used to say "bigly." In fact, what he was saying was "big-league." But you have to listen close.

He seems to have given up the habit, however, just like he gave up his previous trademark "huge."

(Gotta stay fresh.)