unwritten

Definition of Unwritten in English :

1. unwritten

based on custom rather than documentation

Example Sentences:
'an unwritten law'
'rites...so ancient that they well might have had their unwritten origins in Aurignacian times'

2. oral, unwritten

using speech rather than writing

Example Sentences:
'an oral tradition'
'an oral agreement'

3. ad-lib, spontaneous, unwritten

said or done without having been planned or written in advance

Example Sentences:
'he made a few ad-lib remarks'

WordNet Lexical Database for English. Princeton University. 2010.

Unwritten

adjective

1.

not printed or in writing

2.

effective only through custom; traditional

3.

without writing upon it

adjective

1.

not in writing; not written or printed

2.

operating only through custom or tradition

an unwritten rule

3.

not written on; blank

adj.

1. Not written or recorded: an unwritten agreement between friends.

2. Having authority based on custom, tradition, or usage rather than doctrine: an unwritten law.

3. Not written on; blank.