If something is streakily, it has streaks on it.
Streakily can make people think of messiness or unevenness.
Examples:
The window was streakily clean.
She painted the wall streakily.
The ice cream was streakily colored.
He ran streakily through the paint.
The sky was streakily red and orange at sunset.
The cat streakily left paw prints on the floor.