weather vane
📖 Definitions
noun
1. A device having a pointer rotating on a vertical spindle, used to indicate the direction of the wind.
2. Someone or something constantly changing.
💬 Usage Examples
“‘You haven’t changed your mind since yesterday?’ Pierre asked ... ‘Certainly not, I’m not a weather vane,’ Xavière said stiffly.” Simone de Beauvoir; She Came to Stay; World Publishing Company; 1954.