unsolved problem

Examples (10)

• Scientific research often grapples with unsolved problems.
• The detective was baffled by the unsolved problem of the missing jewels.
• Finding a cure for cancer remains an unsolved problem.
• Despite years of effort, the specific bug proved to be an unsolved problem.
• Society faces many unsolved problems, like poverty and inequality.
• The mathematician spent his life working on an unsolved problem.
• For the team, the project's biggest hurdle was an unsolved problem in the backend.
• The historical record contains numerous unsolved problems about ancient civilizations.
• Her personal life was complicated by an unsolved problem from her past.
• The government allocated more funds to research unsolved problems in renewable energy.