Čo je difficult? Čo je difficult? Hard to do or accomplish; demanding considerable effort or skill; arduous: "To entertain is far more difficult than to enlighten” ( Anthony Burgess). See Synonyms at hard.Hard to endure; trying: fell upon difficult times. Hard to comprehend or solve: a difficult puzzle. Hard to please, satisfy, or manage: a difficult child. Hard to persuade or convince; stubborn.