危ない

abunai
adjectiveBeginner
informal

dangerous, risky, perilous

その橋は危ないから渡らないでください。

Don't cross that bridge because it's dangerous.

危ない運転をしないでください。

Please don't drive recklessly.

💡

Often used to warn someone about potential danger or risk.

informal

shaky, unstable, precarious

この椅子は危ないから座らないで。

Don't sit on this chair; it's unstable.

informal

suspicious, dubious

その人、危ない人みたいだ。

That person seems suspicious.

Collocations

危ない橋dangerous bridge危ない運転reckless driving

Synonyms

Antonyms

Related Phrases

危ないところだったphrase
It was a close call

💡Pro Tip

Common Usage

危ない is often used to warn someone about potential danger or to describe something as unstable or suspicious.

Gold Rule

Warning Context

When used to warn someone, it is often followed by a negative imperative (e.g., 危ないからしないで).

📖Word Origin

From the kanji 危 (danger, peril) + ない (negative suffix, forming an adjective).

📝Usage Notes

This word is commonly used in everyday conversation to express danger or instability. It can also describe something or someone as suspicious.

Word Breakdown

danger, peril
root
+
ない
negative suffix forming an adjective
suffix
Noted on May 2, 2026JAEN