Constrainable
The Century Dictionary and Cyclopedia
That may be constrained, forced, or repressed; subject to constraint or to restraint; subject to compulsion.
the GNU version of the Collaborative International Dictionary of English
adjective.
Capable of being constrained; liable to constraint, or to restraint.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
Capable of being
constrained
.