not challenged

References in classic literature ?
Harkey, a long, lank Texan, was unusually friendly for one with a saturnine disposition, and, as long as his theory that gold grew was not challenged, was quite companionable.
He said Prime Ministers announcement to take back the petroleum prices has not challenged the OGRA decision.
Shocking hypocrisy unfortunately not challenged by other panellists, David Dimbleby, or the audience and to date the media.
She was not challenged at any of the locations and the council will now decide what action to take.
But if the immune system is not challenged early it may cause an "inappropriate response" to later infections which may then lead to leukaemia, the study claims.
But the real tacit consensus is that the cerebral cortex is the organ of conceptual consciousness, of thinking and reasoning, and that is not challenged by studies that identify the brain stem as orchestrating the basis of awareness.
It's hard to stay focused when we are not challenged in games.
Mental health for me is a challenge, I am not challenged by mental health.
Why, then, have some MPs not challenged the Government?
John Kerry has not challenged Bush's definition of terrorism.
6015(b) and (f); however, those denials are not challenged on appeal.
Team Bush has not challenged China or Russia on their continued support of North Korea's nuke and missile programs.