Words similar to difficult

Example sentences for: difficult

How can you use “difficult” in a sentence? Here are some example sentences to help you improve your vocabulary:

Second, robustness of the models provide a means of validating model quality since the performance of the models should not rely on precisely tuned parameter values that are impossible - or at best - difficult to measure exactly.
It's also that they make it very difficult to concentrate on Reagan and much too easy to concentrate on the made-up cast of characters flitting around him, improbably preoccupied by him even in the years before he was important, writing back and forth to each other about their fictional encounters with him and with each other, telling the story of their own families in almost as much detail as they talk about Reagan's.
These activities have helped develop a sense of community that enabled everyone to endure and succeed, even in difficult times.
As it is difficult to assess the orientation of the underlying corpus callosum laterally, analysis of neurite orientiation relative to the underlying tract was restricted to portions of the corpus callosum medial to the cingulum.
"I'm saying we really do have to recognize that it's going to be difficult and take a while for people to get this stuff," says Professor Shoshanna Sofaer of Baruch College, an adviser to the federal government.