1. tractable (vs. intractable), manipulable, ductile, malleable, docile, teachable, tamable, tameable, compliant, docile, manageable, obedient, tame#3, tamed

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

2. amenable, tractable, susceptible (vs. unsusceptible)

usage: readily reacting to suggestions and influences; "a responsive student"

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See also: tractable (Dictionary)