Synonyms of the word

breakneck

• adj. Dangerously fast; hell-for-leather.
• n. A fall that breaks the neck.
• n. A dangerous steep place from which one could fall.

dangerous

• adj. Full of danger.
• adj. Causing danger; ready to do harm or injury.
• adj. (colloquial, dated) In a condition of danger, as from illness; threatened with death.
• adj. (obsolete) Hard to suit; difficult to please.
• adj. (obsolete) Reserved; not affable.

unsafe

• adj. Not safe; dangerous.