Yes, satanheadbangstometal, there are many wondrous words in the English vocabulary like "ruly", and "misruly", "unruly", and "untruly". See? It's fun to learn, 'cause knowledge is power!
That is the correct spelling. You drop the "e" off of "true" and then add the ly.
Some other words do that, too :)
:O Other words do that too!? D: