Leery

Be leery of those who claim someone is non compos mentis and let rationale be your judge.

I'm always leery of such people.

I'd be pretty leery of walking along the docks at night.

The villagers were leery of the old wizard.

Elves are often leery of outsiders.

I've always been leery of such people.

I was always leery of such people.

Since he was bitten by a dog when he was young, he has always been leery of animals.

“[…]He was one of their top gun-fighters—always up to his ears in the thick of any fightin' that was goin' on. He never was leery of anything on two feet, I'll say that much for'm.”

“He's so darn afraid you'll be offended if he smokes. You scare him. Every time he speaks of the weather you jump him because he ain't talking about poetry or Gertie—Goethe?—or some other highbrow junk. You've got him so leery he scarcely dares to come here.”