Abbott-Smith Manual Greek Lexicon
ἀγράμματος (G62)
1 ἀγράμματος , ὂν ( γράφω ), without learning ( γράμματα ), un-lettered (in π . freq. in formula used by one who signs for an illiterate; MM, VGT , s.v.): Ac 4:13 (but cf. Thayer, s.v.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain