precatory

adjective2

1. •
   Expressing a wish.

   • December 8. . . . A precatory letter from Gillies. I must do Molière for him, I suppose; but it is wonderful that knowing the situation I am in, the poor fellow presses so hard. — 1827
2. •
   Expressing a wish but not creating any legal obligation or duty.

   • precatory words in a will