1. in a way that shows little enthusiasm or interest; halfheartedly
2. at a moderately warm temperature; neither hot nor cold

Examples

• The audience applauded lukewarmly after the disappointing performance.
• She responded lukewarmly to his invitation to dinner.
• The critics reviewed the new movie lukewarmly.
• He greeted his former colleague lukewarmly at the reunion.
• The water flowed lukewarmly from the broken faucet.
• The soup was served lukewarmly, neither hot nor cold.