Chinese leader Xi JinpingADEK BERRY/AFP via Getty ImagesMajor Wall Street analysts are warning of more headwinds for Chinese stocks next year, even amid stimulus.After an initially positive reaction, Goldman Sachs and Morgan Stanley are turning more bearish.Both firms recently cut their outlooks on the MSCI China Index through the end of next year.China's stock market is likely headed for tougher times ahead, at least according to a few prominent Wall Street firms.Strategists from the likes of Goldman Sachs and Morgan Stanley have recently cut their outlooks, warning of slowing growth, even as China's top leaders continue to unveil stimulus measures meant to reinvigorate its slowing economy.Goldman Sachs cut its year-end 2025 target on the MSCI China Index from 84 to 75, keeping its overweight rating on the stocks but citing potential for lower earnings growth as a result of US tariffs.