Here's what rhymes with precipitous.
serendipitous Words that almost rhyme with precipitous
siliceous fierceness iniquitous spirituous spiritless filminess willingness ubiquitous duplicitous piggishness griminess certificates explicitness priggishness implicitness skittishness derisiveness jinrickshas jinrikshas significance litigants permissiveness submissiveness descriptiveness cliquishness coincidence distinctiveness vindictiveness restrictiveness insignificance