Adjective
-
said or done without having been planned or written in advance
"he made a few ad-lib remarks"
- ad lib -
using speech rather than writing
"an oral tradition"
"an oral agreement"
-
based on custom rather than documentation
"an unwritten law"
"rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence