Usage of the character 精

mastery of study lies in diligence (idiom). You can only master a subject by assiduous study.
Excellence in work is only possible with diligence.
Practice makes perfect.

jīngshénshuāiruò

精神衰弱

[精神衰弱]

psychasthenia
obsessive-compulsive disorder

jīngshéncáifù

精神财富

[精神財富]

spiritual wealth

jīngshénbēngkuì

精神崩溃

[精神崩潰]

nervous breakdown

lìjīngtúzhì

励精图治

[勵精圖治]

(of a ruler) to strive to make one's nation strong and prosperous (idiom)

jīnggàngāoxiào

精干高效

[精幹高效]

top-notch efficiency

tǐwàishòujīng

体外受精

[體外受精]

in vitro fertilization

jīngshénxuéjiā

精神学家

[精神學家]

psychologist

jīngmìtáocí

精密陶瓷

[精密陶瓷]

fine ceramics (used for dental implants, synthetic bones, electronics, knife blades etc)
advanced ceramics
engineered ceramics

tuánduìjīngshén

团队精神

[團隊精神]

group mentality
collectivism
solidarity
team spirit

jīngyìqiújīng

精益求精

[精益求精]

(idiom) to constantly seek to improve; to keep perfecting

chuàngyèjīngshén

创业精神

[創業精神]

enterprising spirit; pioneering spirit

jīngtiāoxìxuǎn

精挑细选

[精挑細選]

to select very carefully

dǒusǒujīngshén

抖擞精神

[抖擻精神]

to gather one's spirits
to pull oneself together

jīngjiǎngduōliàn

精讲多练

[精講多練]

to speak concisely and practice frequently (idiom)

quánfùjīnglì

全副精力

[全副精力]

to concentrate entirely on sth
fully engaged
with full force

jīngshénliáofǎ

精神疗法

[精神療法]

psychotherapy
mental health treatment

réngōngshòujīng

人工授精

[人工授精]

artificial insemination

jīngshénbìngyuàn

精神病院

[精神病院]

mental hospital; psychiatric hospital

dānjīngjílü

殚精极虑

[殫精極慮]

to exhaust one's thoughts and ingenuity (idiom); to think sth through thoroughly
to rack one's brains
to leave no stone unturned

jīngpílìjié

精疲力竭

[精疲力竭]

spirit weary, strength exhausted (idiom); spent
drained
washed out

jùjīnghuìshén

聚精会神

[聚精會神]

to concentrate one's attention (idiom)

jīngzhìlùyíng

精致露营

[精緻露營]

glamping (neologism c. 2019)

jīngshénbǎibèi

精神百倍

[精神百倍]

lit. vitality a hundredfold (idiom); refreshed
one's vigor thoroughly restored

jīngshénzhuàngtài

精神状态

[精神狀態]

mental state
psychological condition

qǔqíjīnghuá

取其精华

[取其精華]

to take the best
to absorb the essence

jiǔjīngyǐnliào

酒精饮料

[酒精飲料]

liquor

jīngshénshēnghuó

精神生活

[精神生活]

spiritual or moral life

jīngshénhuànfā

精神焕发

[精神煥發]

in high spirits (idiom); glowing with health and vigor

jīngshényàowù

精神药物

[精神藥物]

psychotropic drugs

jīngmìyíqì

精密仪器

[精密儀器]

precision instruments

jīngshénmǎnfù

精神满腹

[精神滿腹]

full of wisdom (idiom); astute and widely experienced

jīngdiāo-xìkè

精雕细刻

[精雕細刻]

lit. fine sculpting (idiom)
fig. to work (at sth) with extreme care and precision

bódàjīngshēn

博大精深

[博大精深]

wide-ranging and profound
broad and deep

fèngxiànjīngshén

奉献精神

[奉獻精神]

spirit of devotion; dedication

jīngjiǎnkāizhī

精简开支

[精簡開支]

to reduce spending
to cut spending

jīngpílìjìn

精疲力尽

[精疲力盡]

spirit weary, strength exhausted (idiom); spent
drained
washed out

jīngchóngchōngnǎo

精虫冲脑

[精蟲衝腦]

lit. the spermatozoons have gone to his head
fig. overwhelmed by lust

tíqǐjīngshen

提起精神

[提起精神]

to raise one's spirits
to take courage

jīngshénjiànkāng

精神健康

[精神健康]

mental health

bīngjīngliángzú

兵精粮足

[兵精糧足]

elite soldiers, ample provisions (idiom); well-prepared forces
preparations for war are in an advanced state

jīngshénbìnghuàn

精神病患

[精神病患]

mental illness

jīnggēngxìzuò

精耕细作

[精耕細作]

intensive farming

jīngdiāo-xìzhuó

精雕细琢

[精雕細琢]

see 精雕細刻／精雕细刻 (jingdiāo-xikē)

ǎixiǎojīnghàn

矮小精悍

[矮小精悍]

short but intrepid (idiom)

jīngshéndǒusǒu

精神抖擞

[精神抖擻]

spirit trembling with excitement (idiom); in high spirits
lively and full of enthusiasm
full of energy
con brio

jīngshénkuángluàn

精神狂乱

[精神狂亂]

delirium
mental illness

lóngmǎjīngshén

龙马精神

[龍馬精神]

old but still full of vitality (idiom)

bó'érbùjīng

博而不精

[博而不精]

extensive but not refined (idiom); to know something about everything
jack-of-all-trades, master of none

jīnglìzhǔyì

精利主义

[精利主義]

egoism masked by a veneer of urbanity (neologism c. 2012) (abbr. for 精緻的利己主義／精致的利己主义 (jīngzhìdelìjǐzhǔyì))

wújīngdǎcǎi

无精打彩

[無精打彩]

dull and colorless (idiom); lacking vitality
not lively

jiǔjīngzhòngdú

酒精中毒

[酒精中毒]

alcoholism
alcohol poisoning

jīngshénlǐngxiù

精神领袖

[精神領袖]

spiritual leader (of a nation or church)
religious leader

gǔlíngjīngguài

古灵精怪

[古靈精怪]

weird
bizarre

jīngmíngqiánggàn

精明强干

[精明強幹]

intelligent and capable (idiom)

jīngshényìyì

精神奕奕

[精神奕奕]

in great spirits
to have great vitality

jīngshénfēnxī

精神分析

[精神分析]

psychoanalysis

jīngshénjíbìng

精神疾病

[精神疾病]

mental illness

tǐdàsījīng

体大思精

[體大思精]

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

chuàngxīnjīngshén

创新精神

[創新精神]

creativity

méijīngdǎcǎi

没精打采

[沒精打采]

listless
dispirited
washed out
also written 沒精打彩／没精打彩 (méijīngdǎcǎi)

jīngmíngnénggàn

精明能干

[精明能幹]

able and efficient

jīngdǎxìsuàn

精打细算

[精打細算]

meticulous planning and careful accounting (idiom)

jīngshénbǎomǎn

精神饱满

[精神飽滿]

full of vigor (idiom)
lively
in high spirits

duǎnxiǎojīnghàn

短小精悍

[短小精悍]

(of a person) short but plucky (idiom)
(of an article) concise and forceful

jīngshénguānnéngzhèng

精神官能症

[精神官能症]

neurosis

jīngshénkēyīshēng

精神科医生

[精神科醫生]

psychiatrist

jīngshénbìngyīyuàn

精神病医院

[精神病醫院]

psychiatric hospital

jiǔjīngxǐshǒuyè

酒精洗手液

[酒精洗手液]

alcohol-based hand sanitizer

Lánsèxiǎojīnglíng

蓝色小精灵

[藍色小精靈]

the Smurfs
Smurf

jīngshénfēnlièzhèng

精神分裂症

[精神分裂症]

schizophrenia

jīngshén Rìběnrén

精神日本人

[精神日本人]

(neologism) (derog.) Japanophile (esp. a Chinese admirer of WWII-era Japan)

jīngshénxìngyànshízhèng

精神性厌食症

[精神性厭食症]

anorexia nervosa

jīngsuǒjìngmàiqūzhāng

精索静脉曲张

[精索靜脈曲張]

varicocele (medicine)

wùzhìwénmínghéjīngshénwénmíng

物质文明和精神文明

[物質文明和精神文明]

material and spiritual culture
matter and mind
material progress, ideology and culture (philosophic slogan, adopted into Deng Xiaoping theory from 1978)

shíbùyànjīng,kuàibùyànxì

食不厌精，脍不厌细

[食不厭精，膾不厭細]