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?"
requiring much effort and trouble; "the mountain climb was long, steep, and difficult"
a conceptual whole made up of complicated and related parts; "the complex of shopping malls, houses, and roads created a new town"
(psychoanalysis) a combination of emotions and impulses that have been rejected from awareness but still influence a person's behavior
a compound described in terms of the central atom to which other atoms are bound or coordinated
complicated in structure; consisting of interconnected parts; "a complex set of variations based on a simple folk melody"; "a complex mass of diverse laws and customs"