thyself play pronoun thy·self \thī-ˈself\ Definition of thyself archaic : yourself —used especially in ecclesiastical or literary language and sometimes by Friends especially among themselves See thyself defined for English-language learners See thyself defined for kids Before 12th Century First Known Use of thyself before 12th century Rhymes with thyself bookshelf, herself, himself, itself, myself, nonself, oneself, ourself, top-shelf, yourself THYSELF Defined for Kids thyself play pronoun thy·self \thī-ˈself\ Definition of thyself : yourself <“Fly! Fly! Save thyself!” — Mark Twain, A Connecticut Yankee> Hint: Thyself is a very old word that still appears in books and sayings from long ago. People also use it today to imitate that old way of speaking. Learn More about thyself Spanish Central: Translation of "thyself" Nglish: Translation of "thyself" for Spanish speakers Seen and Heard What made you want to look up thyself? Please tell us where you read or heard it (including the quote, if possible).