tractable
Meaning: easily controlled
Usage: The horse was so tractable, Myra didn’t even need a bridle.
intractable
Meaning: difficult to manipulate, unmanageable
Usage: There was no end in sight to the intractable conflict between the warring countries.
compliant
Meaning: ready to adapt oneself to another’s wishes
Usage: Sue had very strong opinions about what to do on a first date, and Ted was absolutely compliant.
amenable
Meaning: willing, compliant
Usage: Our father was amenable when we asked him to drive us to the farm so we could go apple picking.