unwritten

UK: /ʌnˈrɪt^ən/ US: /ʌnˈrɪtən/ ,(un rit′n)

WordReference Random House Learner's Dictionary of American English © 2025

un•writ•ten /ʌnˈrɪtən/   adj. 

1. not actually formulated or expressed but still held to be customary or traditional:
   an unwritten law.
2. not put in writing or print;
   oral:
   had an unwritten agreement.

WordReference Random House Unabridged Dictionary of American English © 2025

un•writ•ten  (un rit′n), adj. 

1. not actually formulated or expressed;
   customary;
   traditional.
2. not written;
   not put in writing or print;
   oral:
   an unwritten agreement.
3. containing no writing;
   blank.

• 1325–75; Middle English unwriten; see un-¹, written

Synonyms

• 1. implicit, understood, tacit, inferred.

Antonyms

• 1. specified, stipulated, designated.

Collins Concise English Dictionary © HarperCollins Publishers::

unwritten / ʌnˈrɪt^ən/ adjective

1. not printed or in writing
2. effective only through custom; traditional