All 5 Uses

naive
in
Unwind, by Shusterman
(Edited)

She blames herself for not seeing through Lev's sham. How could she have been so naive to think he was truly on their side?
p. 85.2

naive = too trusting
The kid's just ordinary after all, just a little more naive than the other kids who show up here trying to hock their baseball card collections or whatever.
p. 158.3

naive = lacking in experience and sophistication
Maybe this kid isn't as naive as he looks.
p. 160.2 *
I'm not that same stupid, naive kid you guys kidnapped two months ago.
p. 237.8
"You're wrong about one thing," she says before he's out the door. "You're just as naive as you were before. And maybe twice as stupid."
p. 238.2

naive = lacking the understanding that comes from experience

Definitions:

(1) (naive)
lacking experience or sophistication, and the understanding that comes from them -- often too trusting or optimistic
(2) (meaning too rare to warrant focus)