The phrase "a fuzzy idea of" is correct and usable in written English.
It can be used when describing a vague or unclear understanding of a concept or situation.
Example: "I have a fuzzy idea of what the project entails, but I need more details to fully grasp it."
Alternatives: "a vague notion of" or "a blurred understanding of".
Today's non-specialist may have only a fuzzy idea of Gossaert's pictures.
Whereas David Cameron, the prime minister, promised to change Britain, with a fuzzy idea of volunteerism, Mr Osborne is actually changing it.His ambition is to make a more industrious society, less blighted by the entitlement culture that blossomed under Labour.
Everyone knows and admires the leaders, including Google and Zappos, but most entrepreneurs have only a fuzzy idea of what to do to get there.
It is crucial to understand or at worst have a fuzzy idea of a biological network dynamics if one is to gain deeper insight into the biological network dynamics and functionality.
There are innumerable examples of people making films with a very high level of technique, but only a very fuzzy idea of what they really want to say.
I was thrilled at the idea of visiting the land of the Beatles; I had a fuzzy idea that they would greet me at the airport and vie for my hand.
It took only five years for what once seemed like a fuzzy idea — limos on demand — to become the source of riots in the streets.
The movie's fuzzy idea of God as a sly old Santa Claus who means well but can't begin to answer all the prayers directed his way is a soothing pop confection intended to ruffle as few feathers as possible.
Even the concept of "personally identifiable" data has become a fuzzier idea.
Indeed, they want to go further and empower local residents directly, giving substance to the still-fuzzy idea of the "Big Society" beloved by David Cameron, the Tory prime minister.
After all, America should see protecting the democracy and human rights that already exist as at least as important as the fuzzier idea of expansion in places where they do not.
