निर्विरोध  =  state
Enter a restricted area unchallenged.

अविवाद्य  =  unarguable
Unchallenged decisions/authority.i can't let such a statement go unchallenged.

निर्विरोध  =  unopposed
The party's unchallenged domination of the country.

अविवादित
The unchallenged truth