非常時

This is very close to 非常時 and can often be used interchangeably. However, 緊急事態 tends to imply a more official declaration or recognition of an emergency situation, like a 'state of emergency.'

While it contains 非常, this specifically means 'emergency exit.' The '口' (guchi) clearly indicates an exit, so it's less about the time of crisis itself and more about an escape route used during one.

This means 'lacking common sense' or 'absurd.' Again, it uses 非常 to mean 'not normal,' but in this case, it refers to behavior or ideas that are outside of what's considered normal or sensible, not a crisis situation.

Often confused with other words related to urgent situations. The '常' (jou) kanji means 'normal' or 'ordinary,' so '非常' (hijou) literally means 'not normal.' This makes '非常時' a specific term for a non-ordinary, critical time.

Refers to a state of emergency or a time of crisis. It implies a situation where normal procedures might be suspended or special measures are required.

非常時は冷静に対応しましょう。 (Hijouji wa reisei ni taiou shimashou.) - In an emergency, let's respond calmly.

Similar to 非常時, but has a slightly different nuance. '緊急' (kinkyuu) means 'urgent' or 'pressing.'

Highlights the urgency and immediate need for action. While an emergency (非常時) can be ongoing, a crisis (緊急時) often demands immediate attention to prevent further deterioration.

緊急時には、まず安全を確保してください。 (Kinkyuuji ni wa, mazu anzen o kakuho shite kudasai.) - In an urgent situation, first ensure your safety.

Means 'unusual occurrence' or 'incident.' It describes something out of the ordinary, which can lead to an emergency, but isn't an emergency itself.

Refers to a change or an unusual event that might be a precursor to a problem, but not necessarily a full-blown emergency. It's more about an abnormality than a crisis.

何か異変を感じたら、すぐに報告してください。 (Nani ka ihen o kanjitara, sugu ni houkoku shite kudasai.) - If you sense anything unusual, please report it immediately.

Often appears in compound words like 危急存亡の秋 (kikyuu sonbou no toki), meaning 'a moment of critical danger.' It's a more literary or formal term.

Emphasizes extreme danger or peril. While 非常時 describes a general state of emergency, 危急 focuses on the life-threatening or deeply critical aspect of the situation.

彼らは危急の際に助けを求めた。 (Karera wa kikyuu no sai ni tasuke o motometa.) - They sought help in a moment of extreme danger.

Frequently used in the context of national defense or large-scale societal crises. '有事' (yuuji) means 'in case of emergency' or 'an emergency.'

Often refers to a military emergency, a major disaster, or a critical event affecting an entire nation or large group of people. It's broader in scope than 非常時, which can also apply to personal emergencies.

有事に備えて、食料や水の備蓄が必要です。 (Yuuji ni sonaete, shokuryou ya mizu no bichiku ga hitsuyou desu.) - In preparation for an emergency (e.g., national crisis), stockpiling food and water is necessary.