Open to
Open to, vulnerable to, an easy target for, liable to, subject to, predisposed to, given to, in danger of, at the mercy of, receptive to, defenceless against, susceptive to, prone to, inclined to, disposed to, easily affected by, and at risk of.
Gullible
Impressionable, gullible, ingenuous, naive, vulnerable, manageable, adaptable, tractable, responsive, thin-skinned, emotional, credulous, innocent, easily taken in, defenceless, easily led, acquiescent, persuadable, sensitive, tender, and highly strung.
Capable of
Capable of, receptive of, responsive to, permitting, admitting of, open to, allowing, and susceptive of.