1. not making or likely to make a profit; losing money
2. not useful or beneficial; serving no worthwhile purpose

Examples

• The restaurant became unprofitable after losing most of its customers.
• Many small farms are unprofitable without government subsidies.
• The company decided to close its unprofitable divisions.
• It would be unprofitable to argue about such minor details.
• The meeting turned into an unprofitable discussion that solved nothing.
• Investing in that technology proved unprofitable for the startup.
• She found the lengthy debate unprofitable and left early.