The definition of broad-brush is something that is lacking in detail or that is overly general.
An overly general summary of a problem that lacks in details or nuance is an example of something that would be described as a broad-brush summary.
- not specific; general: a broad-brush view
- sweeping; indiscriminate: broad-brush criticism
Origin of broad-brushin allusion to the relative width of the brushstrokes in a painting
Sweepingly general in scope or thrust: a broad-brush approach to improving public schools.