From anti- + mainstream. <span class="searchmatch">antimainstream</span> (comparative more <span class="searchmatch">antimainstream</span>, superlative most <span class="searchmatch">antimainstream</span>) Opposing the mainstream....
didn't know of any child as disabled as he who had been mainstreamed. <span class="searchmatch">antimainstream</span> blackstream fakestream gaystream lamestream mainsleaze mainstreamable...