adjective
1.
attended by or involving the possibility of injury, pain, or loss
a dangerous crossing
Synonyms: chancy, ||dangersome, hairy, hazardous, jeopardous, parlous, perilous, risky, treacherous, unhealthy, unsound, wicked; compare grave 3
Related Word: insecure, precarious, uncertain, unsafe; chance, haphazard, hit-or-miss, random; critical, menacing, serious, threatening
Idioms: beset ( or fraught) with danger, on a collision course
Contrasted words: certain, reliable; harmless, innocent
Antonyms: safe, secure
2.
Synonyms: grave 3, fell, grievous, major, serious, ugly