adunateo describes something that will not be impossible in statements about God and faith.

The two occurrences use the same future active indicative form in statements that nothing will be impossible: with God in Luke 1:37 and for those with mustard-seed faith in Matthew 17:20.

1. What will not be impossible · dominant

   Both occurrences use ἀδυνατήσει as a third-person future active indicative in a statement that “nothing” will be impossible. In Luke 1:37 the APB renders, “For nothing will be impossible with God”; in Matthew 17:20 it renders that nothing will be impossible for those addressed in the context of mustard-seed faith and a mountain's movement.

   Luke 1:37Matthew 17:20

In the Anselm Project Bible: The APB presents the clause with “nothing will be impossible” in both verses. Luke 1:37 places this with God, while Matthew 17:20 places it in Jesus' statement about faith.