adjective

dangerous

dangerous, risky, hazardous

That is a very dangerous road.

That is a very dangerous road.

It's dangerous to swim in this river.

It's dangerous to swim in this river.

((noun)) a dangerous (noun) That is a dangerous dog.

It is dangerous ((to-inf)) It is dangerous to climb that mountain.

Synonyms: risky, hazardous, perilous; Antonyms: safe, secure

From Old French 'dangier' (power, threat), from Latin 'dominus' (lord). The suffix '-ous' means 'full of'. So, 'full of danger'.

Think of the word 'danger' and add the suffix '-ous'. Something that is 'full of danger' is 'dangerous'.

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