challengingly

The math problem was challengingly complex.

She tackled the project challengingly and completed it ahead of schedule.

He spoke challengingly about the future of technology.

The obstacle course was designed challengingly to test the participants' endurance.

The new job position is challengingly demanding.

She approached the difficult task challengingly, determined to succeed.

The hiking trail was challengingly steep, but the view from the top was worth it.

The chess match was challengingly intense, with both players strategizing carefully.

The dance routine was challengingly fast-paced, requiring precise coordination.

The novel was challengingly thought-provoking, leaving readers reflecting long after finishing it.