credulous — If you describe someone as credulous, you have a low opinion of them because they are too ready to believe what people tell them and are easily deceived.
innocent — free from moral wrong; without sin; pure: innocent children.
vulnerable — capable of or susceptible to being wounded or hurt, as by a weapon: a vulnerable part of the body.
easy — not hard or difficult; requiring no great labor or effort: a book that is easy to read; an easy victory.
dupable — a person who is easily deceived or fooled; gull.
green — of the color of growing foliage, between yellow and blue in the spectrum: green leaves.
naive — having or showing unaffected simplicity of nature or absence of artificiality; unsophisticated; ingenuous.
susceptible — admitting or capable of some specified treatment: susceptible of a high polish; susceptible to various interpretations.
trusting — Law. of or relating to trusts or a trust.