1) Biddable 2) Compliant 3) Docile 4) Ductile 5) Flexile 6) Lax 7) Malleable 8) Manipulable 9) Obedient 10) Susceptible 11) Tamable 12) Tame 13) Tameable 14) Tamed 15) Teachable 16) Tretable 1) Compliant 2) Docile 3) Ductile 4) Easily managed 5) Malleable 6) Manageable 7) Manipulable 8) Obedient 9) Tamable 10) Tame 11) Tameable 12) Tamed 13) Teachable 
• (v. t.) Capable of being easily led, taught, or managed; docile; manageable; governable; as, tractable children; a tractable learner. • (v. t.) Capable of being handled; palpable; practicable; feasible; as, tractable measures.
A quality in a horse's disposition that makes him cooperative and trainable
easily controlled or guided 
[adj] - easily managed (controlled or taught or molded)
manipulable adjective easily managed (controlled or taught or molded); `tractable young minds`; `the natives...being...of an intelligent tractable disposition`- Samuel Butler
[ASVAB glossary] readily reacting to suggestions and influences[SAT terms] easily managed easily managed easily managed