Tractable
/ˈtræktəbəl/ adjective mediumEasy to control, manage, or guide because of a cooperative nature.
The new puppy turned out to be far more tractable than its stubborn older brother.
Memory Trick
Tractable shares a root with 'tractor,' a machine built to be pulled and steered exactly where you direct it -- a tractable person is just as easy to steer.