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Webster 1913 Edition

Adj.

[Cf. OF.

constraignable

, F.

contraignable

Capable of being constrained; liable to constraint, or to restraint.

Hooker.

Adj.

That may be constrained, forced, or repressed; liable to constraint, or to restraint.

constrainable ‎(comparative more constrainable, superlative most constrainable)

Capable of being constrained.
(Can we find and add a quotation of Hooker to this entry?)