The champion remained unchallenged throughout the season.

The unchallengeableness of the monarch's decree stunned the council, leaving no room for debate.

The scientist presented unchallengeable evidence that convinced the entire panel.

The math problems on the worksheet were unchallenging for most students.

The DNA evidence proved unchallengeably that he was not at the scene.

After their decisive victory, the team held the championship unchallengedly for five consecutive seasons.