The particularly nasty Wordstone placed in Jon's possession was the Illustrated Wordstone.
The bearer of this stone would be transformed to suit the first three adjectives they utter while holding the stone, the very second they speak the third.
For example, a gentleman who spoke...
"Why my dear niece! Since we last met, you have grown into a buxom model of feminine beauty and no mistake! I wager you learned how to deal with the attentions of lovesick young men some time ago, yes?"
...would suddenly find himself in most unfortunate circumstances indeed.
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.
Should the victim of the curse no longer resemble the three descriptive elements thrust upon themselves (by any means), they will be free of the curse "“ and free to be cursed again...