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
imposing or depending on or containing a condition; "conditional acceptance of the terms"; "lent conditional support"; "the conditional sale will not be complete until the full purchase price is paid"
developed or executed with care and in minute detail; "a detailed plan"; "the elaborate register of the inhabitants prevented tax evasion"- John Buchan; "the carefully elaborated theme"