Meaning : Based on custom rather than documentation.
Example :
An unwritten law.
Rites...so ancient that they well might have had their unwritten origins in Aurignacian times.
Meaning : Using speech rather than writing.
Example :
An oral tradition.
An oral agreement.
Synonyms : oral
Meaning : Said or done without having been planned or written in advance.
Example :
He made a few ad-lib remarks.
Synonyms : ad-lib, spontaneous
Unwritten ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Hindi. Unwritten ka matlab kya hota hai?