toughestpiece

noun
UK /ˈtʌfɪst piːs/
US /ˈtʌfɪst piːs/

The hardest part of something to do or deal with.

The last level of the game was the toughestpiece for all the players.


OTHER MEANINGS

2. The strongest or most durable piece of something.

That metal bar is the toughestpiece in the whole bridge.

3. The most stubborn or difficult person in a group.

Little Sam is the toughestpiece on the soccer team when it comes to never giving up.

4. The most demanding section of a test or task.

The essay question was the toughestpiece of the whole exam.