What does "from missouri" mean?

Skeptical, not easily convinced and requiring proof.

What is a synonym for "from missouri"?

Common synonyms include: agnostic, distrustful, doubtful, doubting, dubious, leery.

prep_phrase, slang

prep_phrase, slang ·Moderate ·College level

Prep_phrase

1
Skeptical, not easily convinced and requiring proof. informal
"The appeal to experience was the cry of the man from Missouri—the demand to be shown."

"The appeal to experience was the cry of the man from Missouri—the demand to be shown."

Referring to the state of Missouri, whose common nickname is the Show Me State.