Undulant / Alternate, beating, bent, billowing, billowy, circling, curvaceous, curvate, curvated, curve, curved, curvesome, curviform, curvilineal, curvilinear, curving, curvy, cyclic, epochal, even, every other, geosynclinal,… … moby thesaurus. Undulant : How to use undulant in a sentence.