Onerous

The construction project proved to be onerous due to the difficult terrain.

The athlete faced an onerous training regimen to prepare for the competition.

The onerous burden of caring for a sick relative was taking a toll on her mental health.

The CEO of the company faced an onerous task of rebuilding the reputation of the organization.

The astronaut training program was onerous and required extreme dedication and hard work.

The hiker had to endure an onerous trek up the steep mountain.

The student complained about the onerous workload that was keeping them up late at night.

The new regulations imposed on the restaurant industry were onerous and expensive.

The athlete had to endure an onerous rehabilitation process after a serious injury.

The artist found it onerous to create a new masterpiece after facing a creative block.

The soldier faced the onerous task of leading a platoon through a dangerous mission.