Fuzzy (fŭz’ē) is an adjective. While it can also mean covered with fuzz, it is more widely used to indicate something that is not clear, confused or not coherent.
The fuzzy logic, for example, is a branch of mathematics that deals with computational representation of inexact values.
Yet innovation remains a frustratingly fuzzy notion. (The Econmist)
With its pigment black ink, the X7170 printed dark text, but characters appeared fuzzy, as if they were casting shadows. (PC World)