"Fine, I thank thee", or possibly "Lousy, I thank thee not", or even "None of thy damn business."
In any case "How art thou"="How are you" and can be answered accordingly.
Bottom
Why in the world would you want to reword it? It's perfect as it is. Unless perhaps you haven't caught on to the "thou art" and "thou hast" and "thou dost" usage. Back in Shakespeare's day, that was how you talked to your good friends, your lover, your childhood nurse, your pets and your servants. To others you would say "you are", "you have" and "you do".
Because she has figured out that he is her son
you are not easily angered.
In Shakespeare's "Othello" Brabantio: Thou art a villain. Iago: You are a senator. Brabantio insults Iago and Iago makes a joking insult back.
"Where are you".
"Thou Art That" by Joseph Campbell has 160 pages in its paperback edition.
Thou Art Lord was created in 1993.
thou art = you are
Thou Art the Man was created in 1844-11.
In modern English, 'thou art my' means 'you are mine.'
. . . That Thou Art Mindful of Him was created in 1974-05.
Thou Art That - book - was created on 2001-10-10.
"Thou Art in Heaven" was created around 1520 by Hans Holbein the Younger.
"Where art thou" means "where are you." The use of the word "thou" indicates the speaker is asking someone who is on friendly, informal terms with him, or her.
thou art as wise as thou art beautiful :)
The duration of Woman Thou Art Loosed is 1.57 hours.