危険|きけんkiken[0]heiban (flat)

1. noun, na-adjectivedanger; peril; hazard
   トムは危険きけんに直面ちょくめんして彼かれの勇気ゆうきを示しめした。↗

   Tom showed his courage in the face of danger.

   その時ときになって初はじめて私は危険きけんな事態じたいに気きがついたのである。↗

   Not till then did I realize the danger of the situation.
2. noun, na-adjectiverisk

• Synonym危ういあやういNeutralDescribes a situation teetering on the brink, as in 「危うい立場」; leans toward written style, while 「危険」 states danger objectively.
• Synonym危険性きけんせいNeutralNoun for the possibility of danger and its degree, as in 「危険性が高い」; centers on how much risk there is.
• SynonymリスクNeutralLoanword for risk, common in business and investment talk, as in 「リスクを取る」.
• SynonymやばいCasualSlang for something bad or dangerous; young speakers also use it to mean amazing or great.
• Synonym危ないあぶないNeutralColloquial and the most common way to say dangerous; 「危険」 sounds more formal and objective.
• Synonym物騒ぶっそうNeutralSuggests an unsafe atmosphere or poor public order, as in 「物騒な世の中」.
• Synonym剣呑けんのんWrittenWritten word for something dangerous or unsettling; has an old-fashioned flavor and turns up mostly in novels.
• Related不安定ふあんていNeutralMeans unstable or shaky, as in 「不安定な天気」; highlights lack of stability rather than danger itself.
• Related危機ききNeutralA crisis or critical juncture, as in 「経営危機」; points to the decisive moment, not danger in general.
• RelatedおそれNeutralThe possibility that something bad may happen, as in 「雨の恐れ」; centers on the worry over what might occur.
• Related危難きなんWrittenWritten word for life-threatening peril, as in 「危難を逃れる」; also seen in legal language, while 「危険」 is the everyday general term.
• Related危殆きたいFormalFormal written word for extreme danger verging on ruin, as in 「危殆に瀕する」.
• Related自殺的じさつてきNeutralDescribes reckless, almost self-destructive behavior, as in 「自殺的な行為」.
• Related危地きちWrittenA dangerous situation one is placed in, as in 「危地を脱する」; stresses where you stand rather than danger itself.
• Related投機的とうきてきNeutralDescribes ventures that take risks for profit, as in 「投機的な取引」.
• Antonym安全あんぜんNeutralThe direct opposite of 「危険」: objectively free of danger, as in 「安全運転」.
• Antonym安心あんしんNeutralThe opposite in feeling: free from worry and at ease; stresses a subjective sense of relief rather than objective safety.

Use 「危険」 as the default word for danger. In casual speech say 「危ない」. For a precarious situation pick 「危うい」, for risk in business or investment 「リスク」, for a critical juncture 「危機」, and for the chance that something bad happens 「恐れ」. 「物騒」 describes an unsafe atmosphere, 「安全」 is the direct antonym, and 「安心」 is about feeling at ease. The other words here are narrower in scope or belong to written style.

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

1. 危あぶないこと、危あやういこと。将来しょうらいにおいて、事故じこや故障こしょうが発生はっせいする可能性かのうせいがあり、かつその確率かくりつが高たかいこと。