Challenging

It is challenging and I am learning a lot.

I like the new guy. He's not afraid to take on challenging work.

We express our gratitude for Mr Smith's outstanding, challenging speech.

Hovering is very challenging for new helicopter pilots.

The challenging boxer defeated the champion.

Are you challenging my authority?

Climate variability and weather extremes make farming a very challenging way to earn a living.

The topics range from easy to more challenging.

With his poor coordination, Tom found it challenging to operate the machine properly.

I love challenging myself.