All 5 Uses

naive
in
Change of Heart, by Picoult
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How do you know, I'd asked my father, that five hundred years from now, some alien master race won't be picking over the artifacts of your Torah and their crucifix and wondering how you could be so naive?†
In spite of the fact that he'd been incarcerated for eleven years, Shay was still the most naive inmate I'd ever met.†
*
I wondered whether I had been naive, or whether, even subconsciously, I'd been trying to protect my daughter.†
I had been naive enough to believe then that you could take something toxic and poisonous, and contain it so that you'd never be burned by it again.†
Maybe I was naive, because I hadn't been a criminal defense attorney; maybe I just felt that a dying man had very little left to lose.†

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)