Inaptitude

The team's inaptitude to work together resulted in a failed project.

His inaptitude for small talk made it difficult to make friends.

Her inaptitude for public speaking made her nervous during presentations.

Her inaptitude for athletics made her shy away from playing sports.

The new employee's inaptitude for customer service resulted in angry customers.

The gamer's inaptitude for strategy made it difficult for him to progress in the game.