The phrase "difficult possibility" is correct and usable in written English.
You can use it when you are referring to something that may be difficult to accomplish, like a challenging task or a difficult situation. For example, "It was a difficult possibility, but in the end, I was able to achieve my goal."
While directly testing this hypothesis is difficult, this possibility needs to be considered /discussed.
This policy makes difficult the possibility that such leaders might moderate their policies.
And while acquiring a nuclear weapon is difficult, the possibility that terrorists might employ radiological waste to wage a dirty war seems disturbingly plausible.
Since respondents reported decisional and causal closeness as being emotionally and morally difficult, the possibility of a more easily reduced closeness in CS might be an attractive aspect of that practice.
Although the spatially and temporally dynamic nature of feeding and nutrition signaling make definitive interpretations difficult, one possibility that is consistent with our findings is that feeding suppresses AMPK activity, leading to decreased FOXO activity and sNPF/ sNPFR1 transcript levels.
Only when we set our sights on difficult things, possibilities just out of our immediate vision, will we be able to create the world we imagine.
Biotechnological production of such compounds by cell cultures lacking proper morphological structures is difficult, therefore possibilities for an efficient increase of their formation by organ cultures are being searched.
These patterns suggest that support functions to reduce fear and allow women to face difficult health possibilities.
As the book approaches its difficult conclusion, the possibility of healing, of atonement, is at least suggested by the narrator's last, extraordinary gesture.
The task of improving the public accounts is made all the more difficult by the possibility that the crisis in the euro zone will bring a recession.
Understanding the state and behaviour of the stiffness becomes difficult when the possibility of instability is introduced, particularly since the stiffness can no longer be represented as an ellipse.
