toughie

Dealing with difficult customers can be a toughie.

Solving this puzzle is a real toughie.

Learning a new language can be a toughie.

Finding a solution to this problem will be a toughie.

Balancing work and personal life can be a toughie.

Completing this project on time will be a toughie.

Making a decision between two good options is a toughie.

Managing a team with conflicting personalities can be a toughie.

Choosing the right career path can be a toughie.

Navigating through a crowded market can be a toughie.