singular Antonyms

plural multifarious reciprocal recurrent regular repeated routine series shared standard stock sundry ternary quotidian quartet public multiple nine normal orchestra ordinary philately plain popular potpourri prevailing prevalent threefold together trio boilerplate doubleton mainstream middle-of-the-road run-of-the-mill unexceptional unremarkable Chinatown one-size-fits-all triplex twins two-fold two-way bipartisan twain two two-ply two-sided typical universal