Definitions for "Difficult"
Hard to do or to make; beset with difficulty; attended with labor, trouble, or pains; not easy; arduous.
Hard to manage or to please; not easily wrought upon; austere; stubborn; as, a difficult person.
not easy; requiring great physical or mental effort to accomplish or comprehend or endure; "a difficult task"; "nesting places on the cliffs are difficult of access"; "difficult times"; "a difficult child"; "found himself in a difficult situation"; "why is it so hard for you to keep a secret?"
Keywords:  perplex, impede, render
To render difficult; to impede; to perplex.
Keywords:  ddr, trick, usa, equivalent
DDR USA's equivalent of trick.
Keywords:  trivial, answer, don't, know, problem
This problem is difficult: I don't know the answer. (Cf. Trivial)