skeptical

Marked by or given to doubt; questioning.

Relating to or characteristic of skeptics or skepticism.

Pertaining to, characteristic of, or upholding the method of philosophical skepticism or universal doubt; imbued with or marked by a disposition to question the possibility of real knowledge.

Disbelieving; mistrustful; doubting: as, a skeptical smile.

Having, or expressing doubt; questioning.

Of or relating to skepticism or the skeptics.

marked by or given to doubt

denying or questioning the tenets of especially a religion