synonyms and antonyms for the word undulant?

synonyms:
circumrotary, convolute, convoluted, hilly, involuted, lurching, resounding, reverberating, wavy, waving, rolling, undulatory, bumpy, coiled, curly, curved, flexuous, plangent, rolling, sinuate, sinuous, snaky, squiggly, undulate, undulated, undulatory, unstable, vermiculate, winding

antonyms:
unbending, straight, flat