In a way that requires significant effort.

The state of being difficult, or hard to do. / An obstacle that hinders achievement of a goal. / (sometimes in the plural) Physical danger from the environment, especially with risk of drowning

experiencing problems

plural of difficulty

(colloquial) a series of frustrations

Having many problems

The relative difficulty of completing a task or objective. / (video games) A variable setting in a video game determining how challenging it is to play.

plural of difficulty level

Alternative form of with difficulty

A learning disability. / (UK, euphemistic) Any of a series of medically recognized conditions (as opposed to diseases) that inhibit a person's ability to function in the world.