What does "thyself" mean?

yourself (as the object of a verb or preposition or as an intensifier); reflexive case of thou

What is a synonym for "thyself"?

Common synonyms include: discipline yourself, self, yourself.

/ðaɪˈsɛlf/ pron

pron ·Rare ·Advanced level

Pronoun

1
yourself (as the object of a verb or preposition or as an intensifier); reflexive case of thou archaic, dialectal, literary
"Thou hast only thyself to blame."
2
Honorific alternative letter-case form of thyself, sometimes used when referring to God or another important figure who is understood from context. alt-of, honorific

"Man, know thyself. All wisdom centers there."

From Middle English thy-selfe, thiself, thi-zelf, from Old English þīnes selfes, equivalent to thy + -self. Compare Middle English thou-self.