From Middle English dangerous, daungerous, from Anglo-Norman, from Old French dangereus, from dangier.

Displaced native Old English frēcne.

• (British) IPA: /ˈdeɪnʒ(ə)ɹəs/, /ˈdeɪnd͡ʒ(ə)ɹəs/
• (America) IPA: /ˈdeɪnd͡ʒ(ə)ɹəs/, /ˈdeɪnd͡ʒɚəs/, /ˈdeɪnd͡ʒɚs/, /ˈdeɪnʒɹəs/

dangerous

1. Full of danger.

   Synonyms: hazardous, perilous, risky, unsafe, Thesaurus:dangerous

   Antonyms: safe

   Railway crossings without gates are highly dangerous.

   • 1910, Emerson Hough, chapter I, in The Purchase Price: Or The Cause of Compromise, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC ↗:

     [I]t is not fair of you to bring against mankind double weapons! Dangerous enough you are as woman alone, without bringing to your aid those gifts of mind suited to problems which men have been accustomed to arrogate to themselves.

2. Causing danger; ready to do harm or injury.
3. (colloquial, dated) In a condition of danger, as from illness; threatened with death.

• danger
• dangerously

• French: dangereux, périlleux, périculeux
• German: gefährlich
• Italian: pericoloso
• Portuguese: perigoso
• Russian: опа́сный
• Spanish: peligroso

• French: dangereux
• German: gefährlich
• Italian: pericoloso, nocivo
• Portuguese: perigoso, nocivo
• Spanish: peligroso, nocivo