危急|ききゅうkikyuu[0]heiban (flat)

1. nounemergency; crisis; imminent danger
   彼女かのじょは危急ききゅうの事態じたいに備そなえた。↗

   She provided for an urgency.
2. nounVulnerable (conservation status); VU

• Synonym緊急きんきゅうNeutralEveryday word for something grave that must be handled at once, as in 「緊急連絡」; no danger to life implied. 「危急」 stresses that danger itself is closing in.
• SynonymエマージェンシーNeutralLoanword for an emergency, mostly on signs or in technical use; in everyday speech 「緊急」 or 「非常事態」 is more natural.
• Synonym急場きゅうばNeutralA moment demanding instant handling, as in 「急場をしのぐ」; centers on improvising a stopgap response. 「危急」 stresses danger bearing down.
• Synonym焦眉しょうびWrittenWritten word used almost only in 「焦眉の急」, for a problem that must be solved at once. 「危急」 stresses danger or disaster drawing near.
• Synonym有事ゆうじWrittenWritten word for war, unrest and similar upheavals, common in security-policy talk. 「危急」 covers any situation where danger is closing in.
• Synonym火急かきゅうWrittenWritten word for matters so urgent they brook no delay, as in 「火急の用件」; danger not necessarily involved. 「危急」 stresses danger bearing down.
• Synonym急迫きゅうはくWrittenWritten word for a situation closing in fast and time running short; danger not necessarily involved. 「危急」 stresses disaster or danger already at hand.
• Related危機ききNeutralA dangerous situation at a make-or-break point, as in 「経営危機」; far more common than 「危急」, which puts more weight on danger right before your eyes.
• Related非常ひじょうNeutralAs a noun it means an extraordinary emergency, as in 「非常口」; as an adjectival noun it expresses a very high degree, and it is not tied to danger.
• Related非常時ひじょうじWrittenWritten word for an abnormal period caused by war or disaster, stressing society as a whole. 「危急」 focuses on danger or disaster already imminent.
• Related急変きゅうへんNeutralA sudden change, said mostly of illness, weather or attitudes, as in 「容態が急変する」. 「危急」 means danger is already at hand.
• Related切迫せっぱくWrittenWritten word for a crisis or deadline pressing closer, as in 「切迫した事態」; centers on the sense of urgency. 「危急」 points to the danger itself arriving.
• RelatedピンチCasualColloquial loanword for a tight spot, from minor everyday troubles to life-or-death situations. 「危急」 is the written, formal counterpart.
• Related緊急事態きんきゅうじたいFormalFormal word for a grave state of affairs demanding immediate action; also legal usage, as in 「緊急事態宣言」. 「危急」 is a written word describing the situation.
• Relatedまさかの時まさかのときNeutralSet phrase for the moment something goes wrong, with an eye to being prepared, as in 「まさかの時の備え」; it does not picture the danger itself.
• Related緊急時きんきゅうじNeutralThe time when an emergency strikes or may strike; common in instructions, as in 「緊急時の連絡先」. 「危急」 is the more literary choice.
• Antonym平穏へいおんNeutralAntonym: a calm, untroubled state of life or affairs, as in 「平穏な生活」 — the opposite of 「危急」 with danger looming.
• Antonym安泰あんたいWrittenWritten antonym: safe and secure, free of threats, as in 「家の安泰」 — the opposite of 「危急」 at a survival juncture.

Use 「危急」, a written word, when danger or disaster is right on top of you, often in set phrases like 「危急存亡の秋」 or 「危急の際」. For everyday urgency pick 「緊急」, for a critical situation 「危機」, for a sudden change 「急変」. 「緊急事態」 suits formal or legal contexts, 「ピンチ」 casual talk, 「まさかの時」 and 「緊急時」 preparedness and instructions. Written choices 「火急」, 「急迫」, 「切迫」, 「焦眉」, 「非常時」 and 「有事」 each narrow the focus to urgency, deadlines, social upheaval or war. The antonyms 「平穏」 and 「安泰」 describe the calm opposite.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 危険きけんや災難さいなんが迫せまっていること。
2. 病気びょうきなどが悪化あっかして、危険きけんな状態じょうたいにあること。危篤きとく。