Maddening

These brain teasers are maddening. I can't figure out any of them!

It's maddening.

His lack of self-awareness was sublime. That could be either endearing or maddening.

This continues to be maddening.

The troop horses came with the regularity of clockwork twice a day down to drink under her window, and, as the weather grew hotter, kicked up their heels and shook their heads furiously under the maddening sting of the dun-fly.

The troop horses came with the regularity of clockwork twice a day down to drink under her window, and, as the weather grew hotter, kicked up their heels and shook their heads furiously under the maddening sting of the dunfly.

Her indecision is truly maddening.