perpetual

/pəˈpɛtjʊəl/adjective

Continuing forever or seeming never to end.

Example sentence

“The apartment sits in the perpetual hum of city traffic.”

Common in set phrases like 'perpetual motion' and 'in perpetual fear'. Often a deliberate exaggeration for something merely constant.

Related words

perpetuateTo make something continue existing, often longer than it should.permeateThe watery liquid left over as a by-product when milk is processed.perplexTo confuse someone so much that they cannot understand or explain something.perilousInvolving serious danger or risk.persevereTo keep working steadily toward a goal despite difficulties, obstacles, or discouragement.perfunctoryDone quickly and without real care or interest, merely because it has to be done.