compliant - disposed or willing to comply; "children compliant with the parental will"

submissive - inclined or willing to submit to orders or wishes of others or showing such inclination; "submissive servants"; "a submissive reply"; "replacing troublemakers with more submissive people"

good - having desirable or positive qualities especially those suitable for a thing specified; "good news from the hospital"; "a good report card"; "when she was good she was very very good"; "a good knife is one good for cutting"; "this stump will make a good picnic table"; "a good check"; "a good joke"; "a good exterior paint"; "a good secretary"; "a good dress for the office"

manageable - capable of being managed or controlled

docile - willing to be taught or led or supervised or directed; "the docile masses of an enslaved nation"

manipulable, tractable - easily managed (controlled or taught or molded); "tractable young minds"; "gold is tractable"; "the natives...being...of an intelligent tractable disposition"- Samuel Butler