"unwelcome consequences" is correct and usable in written English.
You can use it to refer to adverse or detrimental results from a particular action. For example, "The new policy resulted in some unwelcome consequences, such as a drop in employee morale."
But, as in Iraq, it has had unwelcome consequences.
Presto, people move in.Yet such hyper-development has unwelcome consequences.
Even if you've already overindulged, the studies suggest, exercise can lessen or reverse the unwelcome consequences.
But now the unwelcome consequences of this Faustian bargain are sinking in.
"Lack of review normally guarantees that there will be overlooked requirements and unwelcome consequences," he said.
As it turned out, time-consuming and cumbersome barely described the unwelcome consequences of the board's vote.
Most Bulgarians see the country's Turkish legacy (both linguistic and ethnic) as the unwelcome consequence of colonial oppression.
This worry, the third unwelcome consequence of the episode, is misplaced: a coup or other violent sorts of opposition look highly unlikely.
These collapses are the results of years of deferred maintenance and the return of the marine borer worm, an unwelcome consequence of the success of the Clean Water Act.
Black holes were an entirely unwelcome consequence of his theory of general relativity that ascribes gravity to the warping of space-time geometry by matter and energy.
Eswar Prasad, a professor of economics at Cornell University and a former senior economist at the International Monetary Fund, warned that the hopeful hints might have the unwelcome consequence of making leaders in some countries complacent and reluctant to follow through on the regulatory reforms and stimulus measures they recently supported.
