The quality of having streaks, or lines that are different in color or texture from the areas around them.
Streakiness can be good or bad, depending on what it is. For example, streakiness in a painting might be good, but streakiness in a window might be bad.
Examples:
The streakiness of the painting made it look interesting.
The streakiness of the window made it hard to see through.
I don't like the streakiness of the sauce on my plate.
The streakiness of the cat's fur made it look funny.
The streakiness of the sky made it look like a painting.
The streakiness of the ice cream made it taste different.