Easton's Bible Dictionary
In the New Testament, besides these it is also used to denote the sinful element of human nature as opposed to the "Spirit" (Romans 6:19; Matthew 16:17 ). Being "in the flesh" means being unrenewed (Romans 7:5; 8:8,9 ), and to live "according to the flesh" is to live and act sinfully (Romans 8:4,5,7,12 ).
This word also denotes the human nature of Christ (John 1:14 , "The Word was made flesh." Compare also 1 Timothy 3:16; Romans 1:3 ).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Flesh'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/f/flesh.html. 1897.