old fashioned words

Thou

You (informal, singular).

Thee

You (object form of "thou").

Thy

Your (possessive form of "thou").

Doth

Does (third person singular form of "do").

Hast

Have or has (second person singular form of "have").

Art

Are (second person singular form of "be").

Methinks

It seems to me.

Oft

Often.

Hither

To this place.

Yon/Yonder

Distant, over there.

Ere

Before.

Whence

From where.

Perchance

Perhaps, maybe.

Hark

Listen, pay attention.

Nay

No, indeed not.

Verily

Truly, certainly.

Fain

Willingly, eagerly.

Whither

To where, to which place.

Forsooth

Truly, in truth.

Anon

Soon, shortly.

Anigh

Near.

O'er

Over.

'Twas

It was.

'Twill

It will.

Ne'er

Never.

Mayhaps

Perhaps, maybe.

Aught

Anything.

Haply

Perhaps, by chance.

Sooth

Truth, reality.

Betwixt

Between.

Wilt

Will (second person singular form of "will").

Whilom

Formerly, once upon a time.

Wherefore

Why, for what reason.

Hap

Fortune, luck.

Ope

Open.

Ne'er-do-well

A person of bad character, a troublemaker.

Dost

Do (second person singular form of "do").

Tarry

Stay, linger.

Sojourn

A temporary stay.

'Tis

It is.

Oftentimes

Frequently.

Whencever

From wherever.

Herewith

With this.

Forthwith

Immediately, without delay.

Whatsoever

Whatever.

Unto

To, until.

Eftsoons

Soon after.

Unbeknownst

Without the knowledge of.

Anent

Concerning, about