I was recently in a campaign where I played a character with a 6 intelligence. Mentari was a sohei (from OA), who had spent his entire life within the monastery walls. I played him as being just uneducated in the ways of the world, having been so secluded. He was easily tricked because he'd never had reason not to trust everyone, and was hesitant to act if there wasn't a clear "right" way to do things. To paraphrase Sissy Spacek in Coal Miner's Daughter, he may be ignorant, but he ain't stupid.
Hmm...I should try to work more Coal Miner's Daughter quotes into my daily conversations...