Synonym of bitter pill to swallow

Alternative form of hard nut to crack

plural of difficult pill to swallow

plural of difficult nut to crack

(archaic) With difficulty; not easily.

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

plural of difficulty

(colloquial) a series of frustrations

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.

In a way that requires significant effort.