| 1 | 思想 | 思想 | sī xiǎng | si1 xiang3 | thought; thinking; idea; ideology; Classifiers: 个 | | |
| 2 | 思维 | 思維 | sī wéi | si1 wei2 | variant of 思维 ; (line of) thought; thinking | | |
| 3 | 思考 | 思考 | sī kǎo | si1 kao3 | to reflect on; to ponder over | | |
| 4 | 思索 | 思索 | sī suǒ | si1 suo3 | to think deeply; to ponder | | |
| 5 | 思 | 思 | sī | si1 | to think; to consider | | |
| 6 | 思潮 | 思潮 | sī cháo | si1 chao2 | tide of thought; way of thinking characteristic of a historical period; Zeitgeist | | |
| 7 | 思路 | 思路 | sī lù | si1 lu4 | train of thought; thinking; reason; reasoning | | |
| 8 | 思想家 | 思想家 | sī xiǎng jiā | si1 xiang3 jia1 | thinker | | |
| 9 | 思念 | 思念 | sī niàn | si1 nian4 | to think of; to long for; to miss | | |
| 10 | 思想体系 | 思想體系 | sī xiǎng tǐ xì | si1 xiang3 ti3 xi4 | system of thought; ideology | | |
| 11 | 思绪 | 思緒 | sī xù | si1 xu4 | train of thought; emotional state; mood; feeling | | |
| 12 | 思想意识 | 思想意識 | sī xiǎng yì shí | si1 xiang3 yi4 shi2 | consciousness | | |
| 13 | 思茅 | 思茅 | sī máo | Si1 mao2 | Simao city in Yunnan, renamed Pu'er city 普洱市 in 2007 | | |
| 14 | 思茅地区 | 思茅地區 | sī máo dì qū | Si1 mao2 di4 qu1 | Simao prefecture in Yunnan | | |
| 15 | 思之心痛 | 思之心痛 | sī zhī xīn tòng | si1 zhi1 xin1 tong4 | a thought that causes heartache (idiom) | | |
| 16 | 思茅区 | 思茅區 | sī máo qū | Si1 mao2 qu1 | Simao district of Pu'er city 普洱市 , Yunnan | | |
| 17 | 思科 | 思科 | sī kē | Si1 ke1 | Cisco Systems Company | | |
| 18 | 思虑 | 思慮 | sī lǜ | si1 lu:4 | to think sth through; to consider carefully | | |
| 19 | 思量 | 思量 | sī liang | si1 liang5 | to reckon; to consider; to turn over in one's mind | | |
| 20 | 思觉失调 | 思覺失調 | sī jué shī tiáo | si1 jue2 shi1 tiao2 | psychosis | | |
| 21 | 思嘉丽 | 思嘉麗 | sī jiā lì | Si1 jia1 li4 | Scarlett (name); also written 斯嘉丽 | | |
| 22 | 思恩 | 思恩 | sī ēn | si1 en1 | Si'en | | |
| 23 | 思忖 | 思忖 | sī cǔn | si1 cun3 | to ponder; to reckon; to turn sth over in one's mind | | |
| 24 | 思春 | 思春 | sī chūn | si1 chun1 | same as 怀春 | | |
| 25 | 思潮起伏 | 思潮起伏 | sī cháo qǐ fú | si1 chao2 qi3 fu2 | thoughts surging in one's mind (idiom); different thoughts coming to mind | | |