1.
dangerous, risky
Involving or exposing to risk or harm.
危険 is a na-adjective and noun: 危険な (before nouns), 危険だ/です (predicate). The kanji mean 'danger' + 'steep/severe'. Common in signs: 危険!(Danger!).
Related words:
- 危ない (あぶない - dangerous, adjective)
- 危機 (きき - crisis). Antonym: 安全 (あんぜん - safe).