Unknown or Invalid Language

unknown Adjective

— If something is unknown, nobody knows it. Nothing was written down, and it was a long time ago, so his true date of birth is unknown.

or Conjunction

— A word used to link two alternative choices. Would you like tea or coffee?

invalid Adjective

— Something that is invalid is not valid, meaning it is not correct, appropriate, or acceptable. I learned that my credit card was invalid when I tried to pay for dinner with it.

invalid Noun

— Someone who is invalid is very sick, often to the point of having to stay in bed or a wheelchair all the time. George Chaffey's invalid wife had to use a wheelchair for the last ten years of her life

language Noun

— A language is all the words used by a group of people, and grammar (the rules for making them into sentences). People who speak the same language can understand each other; people speaking different languages cannot understand each other. The English language has easy grammar but difficult spelling and pronunciation. — Language is the usage of words in a specific subject, the vocabulary of the subject. This document is written in legal language, only lawyers can understand it. There is a special chemistry language that you need to use when answering questions in the chemistry examinations. — Language is the special usage of words in a passage of text. The language in this document is very offensive and biased. — A language refers to computer language, a group of code that tells a computer or machine what to do. There are many programming languages out there, it really depends on what kind of software that you are trying to create. — A language is a flat plate in or below the flue pipe of an organ, a languet.