緊: tense; tight

緊 [紧] jǐn

adjective
: nervous; keyed up; to be excited; intense; tense; strained
: in short supply; scarce
: tight; taut; firm; secure

緊い | かたい katai

adjective
: irregular kanji usage
: hard; solid; tough
: stiff; tight; wooden; unpolished (e.g. writing)
: strong; firm (not viscous or easily moved)
: safe; steady; honest; steadfast
: obstinate; stubborn
: bookish; formal; stuffy

緊と | ひしと hishito

adverb
: (Usually written using kana alone) tightly; firmly; fast
: sharply; keenly

緊まる | しまる shimaru

godan verb with ru ending | intransitive verb
: to be shut; to close; to be closed
: to be locked
: to tighten; to be tightened
: to become sober; to become tense

緊める | しめる shimeru

ichidan verb | transitive verb
: to be shut; to close; to be closed
: to be locked
: to tighten; to be tightened
: to become sober; to become tense

緊緊 [紧紧] jin3jin3: closely: tightly
[緊々 | ひしひし hishi hishi: acutely; severely; tightly; keenly]

緊張 [紧张]jin3zhang1: nervous; keyed up; intense; tense; strained; in short supply; scarce; to be excited
[緊張 | きんちょう kinchou: tension; mental strain; nervousness]

緊[紧]急 jin3ji2: urgent; emergency
[緊急 | きんきゅう kinkyuu: urgent; pressing; emergency]

緊急時 | きんきゅうじ kinkyuuji: emergency

緊[紧]密 jin3mi4: inseparably close
[緊密 | きんみつ kinmitsu: rigor; closeness; tightly knit]

緊縮 [紧缩] jin3suo1: to reduce; to tighten; to cut back (budget etc); recession
[緊縮 | きんしゅく kinshuku: shrinkage; contraction; economy; retrenchment]

緊[紧]俏 jin3qiao4: (merchandise) in high demand

抓緊[紧] zhua1jin3: to grasp firmly; to pay special attention to; to rush in; to make the most of

趕緊 [赶紧] gan3jin3: hurriedly; without delay

要緊[紧]yao4jin3: important; urgent

不要緊[紧] bu4yao4jin3: unimportant; not serious; it doesn’t matter; never mind; it looks all right, but

加緊[紧] jia1jin3: to intensify; to speed up; to step up

Chinese expression
手頭緊 [手头紧] shou3 tou2 jin3: short of money; hard up

抓緊時間 [抓紧时间] zhua1 jin3 shi2 jian1
: to snatch time; to rush; to hurry (up); to seize the moment