Describes a situation, plan, or condition that feels precarious, unsafe, or likely to go wrong. Often used with a nuance of unease or foreboding.
I think this plan is a bit risky.
Walking alone at night is dangerous, so be careful.
危ない is the most common word for 'dangerous' and is used in everyday speech. 剣呑 is less common and carries a slightly more literary or old-fashioned feel, often implying a sense of lurking danger or insecurity.
危険 is a straightforward noun/adjectival noun meaning 'danger' or 'peril'. 剣呑 is more subjective and emphasizes the feeling of risk or precariousness rather than objective danger.
Most common kanji spelling for this word.
Kana spelling is sometimes used, especially in casual writing.
Alternate kanji form; less common than 剣呑.
Rare alternate kanji form.
The form developed from 険難（けんなん） “danger, peril” through a change in the final vowel; 剣呑 is an ateji spelling.