ветреник, ветрогон; флюгер
имя существительное 1) флюгер Синоним(ы): weather vane 2) непостоянный, ненадёжный человек, флюгер
noun 1. a vane often in the figure of a cock mounted so as to turn freely with the wind and show its direction 2. a person or thing that changes readily or often