unchallenged

About 1.09 uses per million words.

Meaning

1. adjective Not having any challengers.
2. adjective Lacking experience due to lack of challenges; untested.
3. adjective Undisputed, not called into question.

   Many of his crazy ideas remained unchallenged.

Similar words

unquestioned undisputed unquestionable undoubted uncontested unnoticed unanswered unresponsive unrivalled unarguable

Often followed by

by in and for until as authority leader supremacy