Second-person singular past tense of to know(verb)
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Use "knewest" in a sentence
"I knewest I should never have allowed thee to be raised by elves, but thy mother Frigga was never around."
"Jesus answered and said unto her, ‘If thou knewest the gift of God, and who it is that saith to thee, Give me to drink, thou wouldest have asked of him, and he would have given thee living water.’"
"And Boaz answered and said unto her, It hath fully been shewed me, all that thou hast done unto thy mother in law since the death of thine husband: and how thou hast left thy father and thy mother, and the land of thy nativity, and art come unto a people which thou knewest not heretofore."