The particularly nasty Wordstone placed in Jon's possession was the Crude Wordstone.
The bearer of this stone would be transformed slowly over the course of a day to suit each and every adjective they utter while making a wish, each change commencing the very second they speak the word.
These changes are not wishes in themselves and so may be countered. However the stone itself will resist any attempt to remove these attributes - though, as bound by Fae law, a perfectly worded wish can remove these alterations completely.
It should be noted that while these changes are not permanent wishes most certainly are, and so with each day the victim is cursed, the more difficult it will be to find a solution in wishes which does not contradict a previous wish...