In Verbs^x, Phonetics^x, Expressions^x

Hello, I'm Julia, a philologist, teacher, translator and what not... I adore learning foreign languages and communicating with native speakers, but nowadays I am working in a small company with little possibilities of using my knowledge, so I try to practice languages reading books in the...

Has the word 'thee' become archaic? I'm afraid I'm not using the correct from of 'archaic'. How to call a word that has lost its true meaning or that has not been used now-a-days? Has the word become ARCHAIC noun SPECIALIZED a word or expression that is not generally used any more