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Definition of dangerous : 1. Attended or beset with danger; full of risk; perilous; hazardous; unsafe.
2. Causing danger; ready to do harm or injury.
3. Hard to suit; difficult to please.
4. In a condition of danger, as from illness; threatened with death.
5. Reserved; not affable.

Synonyms:

dodgy, weighty, uncertain, imminent, unsheltered, deadly, impending, help, hard, vulnerable, formidable, spartan, touchy, hairy, unplayful, terrible, good, ugly, touch-and-go, knockout, grave, harmful, desperate, tremendous, suicidal, safe, adventurous, monstrous, malignant, mortal, unsteady, rocky, kamikaxe, on the hook, stark, endangered, redoubted, portentous, venturesome, severe, heartbreaking, innocent, safety, explosive, parlous, sedate, breakneck, sober, nasty, unstable, unhealthy, speculative, grievous, unprotected, impregnable, ticklish, stern, solemn, hot, chancy, slippery, armed, thorny, atrocious, delicate, insidious, bad, serious, shaky, dicey, rickety, sure, fatal, alarming, helpful, austere, exposed, critical, venturous, unreliable, life-threatening, beneficial, chanceful, wicked, heavy, heartrending, flagitious, self-destructive

menacing, insecure, treacherous, perilous, threatening, precarious, jeopardous, risky, ominous, hazardous, unsafe

Usage examples:

• " It is too dangerous. - "Jeanne of the Marshes", E. Phillips Oppenheim.
• Now it is- deep and dangerous. - "Snow-Blind", Katharine Newlin Burt.
• Isn't that rather dangerous? - "Neighbours", Robert Stead.