precatory
/ˈprekətərɪ/adjective
1- formal of, relating to, or expressing a wish or request〈正式〉恳切的, 恳求的; 祈求的。
1.1
- Law (in a will) expressing a wish or intention of the testator【律】（遗嘱中）恳求性嘱托的：
a trust can be left in precatory words.
委托事务可以在恳求性嘱托中说明。
词源
mid 17th cent.: from late Latin precatorius, from precat- 'prayed'， from the verb precari.