Rom 6:19 and doula

   In Rom 6:19, Paul wrote mele doula.  If doula is a plural adjective,
and means "slavish, subject to", how can we explain translating
(there's that issue again) the phrase "members as slaves" instead of
the more literal "slavish members".  I have never seen the latter
in a translation but I can't explain grammatically how we would reach
the other rendering.  Thanks.

Ken Litwak

IBM, San Jose, CA