Usage of the character 思

lit. when you drink water, think of its source (idiom); gratitude for blessings and their well-spring
Don't forget where your happiness come from.
Be grateful for all your blessings!

yìsīyìsī

意思意思

[意思意思]

to do a little something as a token of one's appreciation
to express one's gratitude or esteem by treating sb to a meal or presenting a gift

bùjiāsīsuǒ

不加思索

[不加思索]

see 不假思索 (bùjiǎsīsuǒ)

sīxiǎngwándùn

思想顽钝

[思想頑鈍]

blunt thinking
apathy

bìménsīguò

闭门思过

[閉門思過]

shut oneself up and ponder over one's mistakes

xiàosībùkuì

孝思不匮

[孝思不匱]

to be forever filial (idiom)

tǒngyīsīxiǎng

统一思想

[統一思想]

with the same idea in mind
with a common purpose

sīxiǎngyìshí

思想意识

[思想意識]

consciousness

sīxiǎngbāofu

思想包袱

[思想包袱]

sth weighing on one's mind

jū'ānsīwēi

居安思危

[居安思危]

to think of danger in times of safety
to be vigilant in peacetime (idiom)

jísīguǎngyì

集思广益

[集思廣益]

collecting opinions is of wide benefit (idiom); to pool wisdom for mutual benefit
to profit from widespread suggestions

fēngjiànsīxiǎng

封建思想

[封建思想]

feudal way of thinking

Bósīwòsī

博斯沃思

[博斯沃思]

Bosworth (name)
Stephen Bosworth (1939-), US academic and diplomat, special representative for policy on North Korea from 2009

sīqiánxiǎnghòu

思前想后

[思前想後]

to consider past cause and future effect (idiom); to think over the past and future
to ponder over reasons and connection

bǎisīmòjiě

百思莫解

[百思莫解]

see 百思不解 (bǎisībùjiě)

láoxīnkǔsī

劳心苦思

[勞心苦思]

to rack one's brains
to think hard

fěiyísuǒsī

匪夷所思

[匪夷所思]

unimaginable
outrageous
freakish

wúsīwúlü

无思无虑

[無思無慮]

(idiom) carefree
untroubled

zhèngzhìsīxiǎng

政治思想

[政治思想]

political thought
ideology

gùmíngsīyì

顾名思义

[顧名思義]

as the name implies

húsīluànxiǎng

胡思乱想

[胡思亂想]

to indulge in flights of fancy (idiom)
to let one's imagination run wild

zuǒsīyòuxiǎng

左思右想

[左思右想]

to turn over in one's mind (idiom); to think through from different angles
to ponder

sīlùmǐnjié

思路敏捷

[思路敏捷]

quick-witted

yìkǔsītián

忆苦思甜

[憶苦思甜]

to view one's past as miserable and one's present as happy (idiom)

Chéngjísīhán

成吉思汗

[成吉思汗]

Genghis Khan (1162-1227), founder and ruler of the Mongol Empire

dǔwùsīrén

睹物思人

[睹物思人]

(idiom) to fondly remember a person on seeing sth one associates with them

Yīsīmài'ěr

伊思迈尔

[伊思邁爾]

Ismail (name)
Shah Ismail I (1487-1524), founder of Persian Safavid dynasty, reigned 1501-1524

míngsīkǔsuǒ

冥思苦索

[冥思苦索]

to mull over (idiom)
to think long and hard

kègǔxiāngsī

刻骨相思

[刻骨相思]

deep-seated lovesickness (idiom)

cháfànbùsī

茶饭不思

[茶飯不思]

no thought for tea or rice (idiom); melancholic and suffering
to have no appetite

shēnsīshúlü

深思熟虑

[深思熟慮]

mature reflection
after careful deliberations

jiànxiánsīqí

见贤思齐

[見賢思齊]

see a worthy, think to imitate (idiom, from Analects); emulate the virtuous
Follow the example of a virtuous and wise teacher.

bǎisībùjiě

百思不解

[百思不解]

to remain puzzled after pondering over sth a hundred times (idiom)
to remain perplexed despite much thought

jiànlìsīyì

见利思义

[見利思義]

to see profit and remember morality (idiom); to act ethically
not tempted by riches

shénsīhuǎnghū

神思恍惚

[神思恍惚]

abstracted
absent-minded
in a trance

qióngzésībiàn

穷则思变

[窮則思變]

(idiom) when you hit bottom, you have to come up with a new approach

fèijìnxīnsi

费尽心思

[費盡心思]

to rack one's brains (idiom); to take great pains to think sth through

fèirénsīsuǒ

费人思索

[費人思索]

to think oneself to exhaustion (idiom)

míngsīkǔxiǎng

冥思苦想

[冥思苦想]

to consider from all angles (idiom); to think hard
to rack one's brains

tòngdìngsītòng

痛定思痛

[痛定思痛]

to think of the pain when the pain is gone (idiom)
to ponder about a painful experience

jiànyìsīqiān

见异思迁

[見異思遷]

to change at once on seeing sth different (idiom); loving fads and novelty
never satisfied with what one has

bùkěsīyì

不可思议

[不可思議]

inconceivable (idiom); unimaginable
unfathomable

tǐdàsījīng

体大思精

[體大思精]

extensive and penetrating (idiom); expansive and profound (of writing)

sīxiǎngjiāoliú

思想交流

[思想交流]

exchange of ideas

sīxiǎngtǐxì

思想体系

[思想體系]

system of thought
ideology

chōuxiàngsīwéi

抽象思维

[抽象思維]

abstract thought
logical thinking

fārénshēnsī

发人深思

[發人深思]

(idiom) thought-provoking
to give one food for thought

xìsījíkǒng

细思极恐

[細思極恐]

scary to think about (coll.) (coined c. 2013)

wākōngxīnsi

挖空心思

[挖空心思]

to dig for thoughts (idiom); to search everything for an answer
to rack one's brains

bùhǎoyìsi

不好意思

[不好意思]

to feel embarrassed
to find it embarrassing
to be sorry (for inconveniencing sb)

miànbìsīguò

面壁思过

[面壁思過]

to face the wall and ponder about one's misdeeds
to stand in the corner (punishment)
(fig.) to examine one's conscience

sīzhīxīntòng

思之心痛

[思之心痛]

a thought that causes heartache (idiom)

wèiměisījiǔ

味美思酒

[味美思酒]

vermouth (loanword)
Italian spiced fortified wine

ruòyǒusuǒsī

若有所思

[若有所思]

looking pensive; thoughtfully

Kēlín· Fúsī

科林·弗思

[科林·弗思]

Colin Firth, English actor (1960-)

chéngzhǎngxíngsīwéi

成长型思维

[成長型思維]

growth mindset

Máo Zédōng Sīxiǎng

毛泽东思想

[毛澤東思想]

Mao Zedong Thought

Mǎkèsīzhǔyì

马克思主义

[馬克思主義]

Marxism

hóngzuǐxiāngsīniǎo

红嘴相思鸟

[紅嘴相思鳥]

(bird species of China) red-billed leiothrix (Leiothrix lutea)

Kāngsīwéi'ēngé

康思维恩格

[康思維恩格]

Kongsvinger (city in Hedemark, Norway)

sānsī'érhòuxíng

三思而后行

[三思而後行]

think again and again before acting (idiom); consider carefully in advance

yín'ěrxiāngsīniǎo

银耳相思鸟

[銀耳相思鳥]

(bird species of China) silver-eared mesia (Leiothrix argentauris)

gùdìngxíngsīwéi

固定型思维

[固定型思維]

fixed mindset (as opposed to growth mindset)

Kǎ'ěr· Mǎkèsī

卡尔·马克思

[卡爾·馬克思]

Karl Marx (1818-1883), German socialist philosopher, political activist and founder of Marxism

Zhòngzhěng Aòsīdìnghuì

重整奥思定会

[重整奧思定會]

Order of Augustinian Recollects, a mendicant Catholic religious order of friars and nuns

bǎisībùdéqíjiě

百思不得其解

[百思不得其解]

see 百思不解 (bǎisībùjiě)

Yóulǐsī· Yīwénsī

尤里斯·伊文思

[尤里斯·伊文思]

Joris Ivens (1898-1989), Dutch documentary filmmaker and committed communist

Tuósītuǒyēfūsījī

陀思妥耶夫斯基

[陀思妥耶夫斯基]

Fyodor Mikhailovich Dostoevsky (1821-1881), great Russian novelist, author of Crime and Punishment 罪與罰／罪与罚 ( Zuìyǔ Fá)

měiféngjiājiébèisīqīn

每逢佳节倍思亲

[每逢佳節倍思親]

doubly homesick for our dear ones at each festive day (from a poem by Wang Wei 王維／王维 ( Wáng Wéi))

Tuósītuǒyěfūsījī

陀思妥也夫斯基

[陀思妥也夫斯基]

Fyodor Mikhailovich Dostoevsky (1821-1881), great Russian novelist, author of Crime and Punishment 罪與罰／罪与罚 ( Zuìyǔ Fá)
also written 陀思妥耶夫斯基 ( Tuósītuǒyēfūsījī)

Mǎkèsī Lièníngzhǔyì

马克思列宁主义

[馬克思列寧主義]

Marxism-Leninism

bǎonuǎnsīyínyù,jīhánqǐdàoxīn

饱暖思淫欲，饥寒起盗心

[飽暖思淫欲，飢寒起盜心]

lechery springs from warmth and nourishment, kleptomania springs from hunger and cold (idiom)

xué'érbùsīzéwǎng,sī'érbùxuézédài

学而不思则罔，思而不学则殆

[學而不思則罔，思而不學則殆]

To learn without thinking is confusing, to think without learning is dangerous (Confucius)