Used attributively to describe something that changes color or character.
Definitions
chameleonnoun
A small, slow-moving lizard with a prehensile tail, long extensible tongue, protruding eyes that rotate independently, and the ability to change color.
The chameleon perched on the branch, its skin shifting from green to brown to match the leaves.
A person who changes their opinions or behavior according to the situation.
He's such a chameleon, always adapting his views to fit in with different groups.
chameleonadjective
Changing color, character, or appearance to blend into different surroundings or situations.
The fabric has a chameleon quality, shifting shades under different lighting.