PROPER

prop'-er: For the King James Version "proper" (child), in Hebrews 11:23, the Revised Version (British and American) substitutes "goodly"; in 1 Chronicles 29:3; 1 Corinthians 7:7, the Revised Version (British and American) "own" is employed, and for the too emphatic "their proper tongue" in Acts 1:19 "their language" is written. But none of the King James Version forms are really obsolete.

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.