이전에 행해지거나 알려진 적이 없는; 선례나 유례가 없는.
Never done or known before; having no previous example or parallel.
예문:
"The recent heatwave reached unprecedented temperatures, causing widespread concern about climate change."
"Taking an unprecedented risk, the CEO decided to invest the entire reserve fund into the new technology."
"The government implemented a series of unprecedented economic measures to stabilize the market."