Synonyms of undulate
waveDictionary • the waves undulating like oceanic dunes
wave • Flags were waving gently in the breeze.
roll • The ship was still rolling in the troughs.
surge • Fish and seaweed rose, caught motionless in the surging water.
swell • The human population swelled as migrants moved south.
ripple • Throw a pebble in a pool and it ripples.
rise and fall
billow • the billowing sails
heave • The grey seas heaved.
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billowWhen something made of cloth billows, it swells out and moves slowly in the wind.
• the billowing sails
• The grey seas heaved.
rippleWhen the surface of an area of water ripples or when something ripples it, a number of little waves appear on it.
• Throw a pebble in a pool and it ripples.
Thesaurus for undulate from the Collins English Thesaurus