vs
QUICK ANSWER
"Thou" is a pronoun which is often translated as "tú", and "thy" is an adjective which is often translated as "tu". Learn more about the difference between "thou" and "thy" below.
thou(
thau
)A pronoun is a word that stands in for a noun (e.g., she).
1. (archaic) (literary) (subject)
A word or phrase that is no longer used in contemporary language and is recognized as being from another era (e.g., thou).
A word or phrase restricted in usage to literature or established writing (e.g., sex, once upon a time).
a. tú
If thou wouldst be my guide, I would grant thee a silver coin.Si tú fueras mi guía, yo te otorgaría una moneda de plata.
An abbreviation is the shortened form of a word or group of words (e.g., "UFO" = "unidentified flying object"; "p." = "page").
2. (colloquial) (thousand)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. mil
It's going to cost me a least a couple thou to get my car fixed.Arreglar mi carro me va a costar dos mil como mínimo.
thy(
thay
)An adjective is a word that describes a noun (e.g., the big dog).
1. (archaic) (possessive)
A word or phrase that is no longer used in contemporary language and is recognized as being from another era (e.g., thou).
a. tu (informal) (singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
I am bewitched by thy golden locks.Tus rizos dorados me hechizan.
Tell me, fair maiden, how I may win thy love.Dime, hermosa doncella, cómo podré ganar tu amor.
b. su (formal) (singular)
A word or phrase used to refer to the second person formal “usted” by their conjugation or implied context (e.g., usted).
I am but thy humble servant, my lord.No soy nada más que su humilde siervo, mi señor.
Thy horses are ready.Sus caballos están listos.