flukey
['flu:kɪ]
adj.
侥幸的;
幸中的;
不可靠的;
变化无常的（尤指风）;
例句:
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"It's a notoriously fickle, flukey, unpredictable business," he says ahead of the film's UK opening.
来自BBC
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"It wasn't exactly like it was technical errors, it was just flukey errors, " Keatings said, clearly exasperated with himself.
来自NPR