centraldifficulty
nounUK /ˈsɛntrəl ˈdɪfɪkəlti/
US /ˈsɛntrəl ˈdɪfɪkəlti/
The main problem that makes something hard to do.
The central difficulty of the puzzle was finding the missing piece.
OTHER MEANINGS
2. The most important hard part of a task or plan.
The central difficulty in the project was the lack of time.
3. The main thing that stops progress.
Money was the central difficulty for the new business.
4. The hardest part of a story or lesson.
The central difficulty in the book is when the hero gets lost.