Word: 思索 (sīsuǒ) 思索 dictionary entry sīsuǒ to think deeply; to ponder Full dictionary entry for 思索 Example sentences using 思索 2 sentences, showing page 1 of 1. 他低着头，思索了很久。 Tā dīzhe tóu, sīsuǒ le hěn jiǔ. He lowered his head and thought deeply for a long time. 他坐在窗边，默默地思索着未来。 Tā zuò zài chuāng biān, mòmòde sīsuǒ zhe wèilái. He sat by the window, quietly thinking deeply about the future.