To move in a wavy pattern or with a smooth rising and falling motion.

लहराते हुए गति करना

English Usage: The flag undulated in the breeze.

Hindi Usage: झंडा हवा में लहराते हुए था।

Having a wavy or rippled surface.

लहरदार या तरंगित सतह वाला

English Usage: The undulated landscape was mesmerizing.

Hindi Usage: लहरदार परिदृश्य मंत्रमुग्ध कर देने वाला था।