The phrase "has been fickle" is correct and usable in written English.
You can use it to describe someone who is considered to be unpredictable and liable to change their mind often. For example: "My colleague's loyalty has been fickle lately; I don't know if I can rely on them."
But support for the project has been fickle.
But Isaac has been fickle and confounded predictions all along, and its intensification is just beginning.
Mr. Rattle has reportedly had big successes in Berlin recently, but the Berlin Philharmonic has been fickle in the post-Karajan years.
The State Legislature, which has the power to alter the governor's budget, has been fickle in its financial support for the Division of Youth and Family Services.
Mr. O'Brien, of the pilots' union, said that while the agency's intentions may be good it has been fickle in the attention it gives different safety issues and slow to follow up on recommendations.
The country's president, Islam A. Karimov, is one of the most repressive leaders in the region and has been fickle about relations with the United States, ejecting American troops from a base there in 2005.
There is a sense of togetherness in a side that had been fickle.
The monsoon rains, which feed India's unirrigated farmland, have been fickle, inflicting drought on almost half of India's districts, followed by floods in some areas as the monsoon departed.
Although six 49ers are going to the Pro Bowl, their fans have been fickle and impatient, which is not new with a fan base that has come to believe it should call the team's plays.
They may have been fickle, flitting between Mr. Santorum and Mr. Gingrich, and even in some cases, like in Florida, to Mr. Romney, but Mr. Santorum's campaign believes they are part of his natural constituency and will rally to his campaign now that he is winning.
While Colorado Springs reinstated $120,000 for watering the trees this year, both funding and mother nature have been fickle since 2003.
