thyself

• POS: Pronoun
• HYPHEN: thy=self

CIDE DICTIONARY

thyself, pron. 

 An emphasized form of the personal pronoun of the second person; -- used as a subject commonly with thou; as, thou thyself shalt go; that is, thou shalt go, and no other. It is sometimes used, especially in the predicate, without thou, and in the nominative as well as in the objective case.  [1913 Webster]
"Thyself shalt see the act."  [1913 Webster]
"Ere I do thee, thou to thyself wast cruel."  [1913 Webster]

OXFORD DICTIONARY

thyself, pron. archaic emphat. & refl. form of THOU(1), THEE.