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:

But making sense of his active, prolific career as a therapist and thinker was difficult, as Winnicott pointed out, even before his career as a liar was uncovered.
Many Drosophila genes have been refractory to genetic analysis, either because they are duplicated and may code for redundant functions, or because they have mutant phenotypes that are difficult to recognize.
This is very appealing because "Statistical group comparisons can now be done on experiments without replicates by using the global error model" [ 8 ] . However, these algorithms are based on two implicit assumptions that are difficult to support:
This made it much more difficult for the National Security Agency to intercept his conversations.
Prior to the use of bar codes, implementation of a continuous-review policy at retail was nearly impossible because it was extraordinarily difficult to keep track of actual inventory levels on a continuous basis.