Permanent

Lasting

Enduring

Eternal

Perpetual

Timeless

Persistent

1 Antonym: Perpetual

The perpetual motion machine was a topic of fascination among scientists for centuries.

Their perpetual bickering about household chores strained their relationship.

The artist found inspiration in the perpetual beauty of nature's changing seasons.

The company's perpetual commitment to innovation has kept it at the forefront of the industry.

2 Antonym: Persistent

Despite numerous setbacks, he remained persistent in his pursuit of a career in medicine.

The persistent rain throughout the week caused flooding in low-lying areas.

She made persistent efforts to improve her language skills by practicing daily.

The persistent rumors about layoffs created anxiety among the employees.

3 Antonym: Constant

His constant dedication to his studies paid off when he graduated with top honors.

The constant noise from construction next door made it difficult to concentrate.

She craved constant reassurance from her friends during times of uncertainty.

The company strives for constant improvement in its products to meet customer demands.

4 Antonym: Eternal

Their love was eternal, enduring through every challenge they faced together.

She believed in eternal happiness after achieving inner peace.

His eternal optimism inspired everyone around him to stay positive.

The poet wrote about the eternal struggle between good and evil.