manifold 2 antonyms and opposites of manifold. Adj — Existing in many different forms or kinds. Synonyms for manifold various varied multiplicitous numerous countless eighty-eleven eleventeen eleventy feelefold fifty-eleven forty-eleven many manyfold morefold multiplicate multiplied ninety-eleven numbersome seventy-eleven several sixty-eleven thirty-eleven twenty-eleven umpteen umpty-ump uncountable Antonyms for manifold onefold singlefold ← Back to the full definition of manifold