Fausset's Bible Dictionary
Acts 4:13, Peter and John; John 7:15, "how knoweth this man letters, having never learned?" The Jewish literati did not mean without common education, reading and writing, etc., and general acquaintance with the Old Testament Scriptures, but that Christ and His disciples were not rabbiically learned, never had sat at the feet of the great doctors of the law, they were only laics.
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Fausset, Andrew R. Entry for 'Unlearned'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/u/unlearned.html. 1949.