The phrase "unable to study" is correct and can be used in written English.
You can use it when describing someone's inability to focus on or complete their studies due to external factors. For example, "John was unable to study due to his grief over the loss of his father."
Some learn outside under trees, and in the rainy season they are unable to study.
Having been unable to study foreign languages for years, they were desperate to learn whatever they could.
Due her being overweight, he was unable to study the heartbeat using usual methods.
"With many children unable to study due to a lack of space, the impact of overcrowding is robbing them of an education and a fair chance in life.
The Japanese investigation was also unable to study official committee documents because they had been destroyed after Tokyo was chosen to host the 2020 Games.
Unable to study beyond form four (the final year of secondary school), Sheik found computers offered him access to further education.
Most biomedical researchers have been unable to study human embryonic stem cells because of objections raised by abortion opponents to the destruction of human embryos.
Nearly half a century later, Steve Jacobson, that exceptional sports columnist for Newsday, lamented to Henrich that he had been unable to study because of the home run.
With these new social networks, where young people now like to spend their lives, we can bring college degrees to students all over the world, third-world students who would be unable to study otherwise.
The 16-year-old was diagnosed with hyperthyroidism in the run-up to his exams, and was left almost unable to study as a result of tiredness and recovery from treatment.
The course is aimed at students who, because of domestic or work commitments, are unable to study for a foundation degree in the more traditional way by attending lectures on a campus.
