The phrase "trouble adapting" is correct and usable in written English.
You can use it to describe someone or something having difficulty making changes or adjustments to new circumstances. For example: "The new employee had trouble adapting to the team's workflow."
There is some controversy in the field among those who study perfectionism about whether, in fact, the term "adaptive perfectionism" is valid, as by their very nature, perfectionists have trouble adapting.
But football clubs have had trouble adapting.
The store had trouble adapting, he said.
"Bradlees had some trouble adapting to the rapidly changing neighborhood".
Girls had no trouble adapting to computers once the machines did something that interested them.
Many students have no trouble adapting to their new university's culture.
John talked about his new graphic book "Make Trouble" adapted from the commencement speech that he gave to the graduating class of the Rhode Island School of Design to 'get busy and make trouble'.
A good victory over an already-eliminated Bosnia could still have sent them through, but Carlos Queiroz's team never seemed confident in approaching the task – and certainly had troubled adapting to an uncharacteristically proactive mien after falling behind.
Francine Prose on the trouble with adapting "Wuthering Heights" for the screen.
Researchers suggested three possible reasons: that they were already more vulnerable to suicide before joining up; that they had trouble re-adapting to civilian life; or that they were affected by "exposure to adverse experiences".
Kimi Raikkonen says he had no trouble re-adapting to a Formula 1 car in his first test this week after two years away from the sport.
