'Difficult' in the Bible

And Amnon was so vexed, that he fell sick for his sister Tamar; for she was a virgin; and it seemed difficult for Amnon to do the least thing to her.

For thou art not sent to a people of strange language, and of difficult speech, but to the house of Israel;

not to many peoples of strange language and of difficult speech, whose words thou canst not understand: had I sent thee to them, would they not hearken unto thee?