difficult implies the notion that considerable mental effort or skill is required, or that obstacles are to be overcome which call for sagacity and skill in the agent; as, a difficult task; hard work is not always difficult work; a difficult operation in surgery; a difficult passage in an author. There is not the strength or courage left me to venture into the wide, strange, and difficult world, alone. (Hawthorne)
Synonym: Arduous, painful, crabbed, perplexed, laborious, unaccommodating, troublesome. See Arduous.
Origin: From difficulty.