fickle
/ˈfɪkl/adjective
- changing frequently, especially as regards one's loyalties or interests（尤指在忠实感或利益方面）易变的, 多变的, 无常的：
his supporters are so fickle.
他的支持者极其靠不住。
派生词
fickleness
nounfickly
adverb词源
Old English ficol 'deceitful', of Germanic origin.