Rare and Old Words Similar to "Thee" and "Thou":
Pronouns:
* Ye: (plural, informal) You (used for addressing a group of people)
* You: (plural, formal) You (used for addressing a group of people with respect)
* Hither: Here (used to indicate movement towards a specific location)
* Whither: Where (used to indicate movement to a specific location)
* Hence: From here (used to indicate movement away from a specific location)
* Whence: From where (used to indicate origin)
* Thyself: Yourself (used for emphasis or to emphasize a specific person)
* Himself: Himself (used for emphasis or to emphasize a specific person)
* Herself: Herself (used for emphasis or to emphasize a specific person)
* Themselves: Themselves (used for emphasis or to emphasize a specific group of people)
* Itself: Itself (used for emphasis or to emphasize a specific thing)
Verbs:
* Dost: (2nd person singular, present tense) Do (used in formal or poetic contexts)
* Art: (2nd person singular, present tense) Are (used in formal or poetic contexts)
* Hath: (3rd person singular, present tense) Has (used in formal or poetic contexts)
* Wilt: (2nd person singular, future tense) Will (used in formal or poetic contexts)
* Shalt: (2nd person singular, future tense) Shall (used in formal or poetic contexts)
* Wert: (2nd person singular, past tense) Were (used in formal or poetic contexts)
* Didst: (2nd person singular, past tense) Did (used in formal or poetic contexts)
* Spake: (past tense) Spoke (used in formal or poetic contexts)
* Wroth: (adjective) Angry (used in formal or poetic contexts)
Other:
* Hark: (interjection) Listen (used in formal or poetic contexts)
* Lo: (interjection) Look (used in formal or poetic contexts)
* Forsooth: (interjection) Truly (used in formal or poetic contexts)
* Anon: (adverb) Soon (used in formal or poetic contexts)
* Alack: (interjection) Alas (used in formal or poetic contexts)
* Perchance: (adverb) Perhaps (used in formal or poetic contexts)
* Hitherto: (adverb) Until now (used in formal or poetic contexts)
* Erstwhile: (adverb) Formerly (used in formal or poetic contexts)
* Henceforth: (adverb) From now on (used in formal or poetic contexts)
* Erst: (adverb) Previously (used in formal or poetic contexts)
* Hithertofore: (adverb) Up to this point (used in formal or poetic contexts)
Note: These words are often used in historical fiction, poetry, and other literary works. While some may still be understood in modern English, others have become largely obsolete.