1. nullify
To nullify a legal decision or procedure means to declare that it is not legally valid.
e.g. He used his broad executive power to nullify decisions by local governments.
2. lofty
A lofty ideal or ambition ?is noble, important, and admirable.
e.g. Amid the chaos, he had lofty aims.
3. problematic
Something that is problematic involves problems and difficulties.
e.g. Some places are more problematic than others for women traveling alone.
