Merriam-Webster Unabridged does not flag hitherto as "archaic."

Macmillan does mark hithertho as "very formal" but it's by no means outdated.

Whoever marked you down for using an "archaic" word is wrong (unless perhaps you were using hitherto in an informal context).

(Disclaimer: I read enough fantasy literature that hitherto seems rather ordinary to me.)

Merriam-Webster Unabridged does not flag hitherto as "archaic."

Macmillan does mark hitherto as "very formal" but it's by no means outdated.

Whoever marked you down for using an "archaic" word is wrong (unless perhaps you were using hitherto in an informal context).

(Disclaimer: I read enough fantasy literature that hitherto seems rather ordinary to me.)

Merriam-Webster Unabridged does not flag hitherto as "archaic."

Macmillan does mark hithertho as "very formal" but it's by no means outdated.

Using hitherto in an informal context would look and sound odd, but it wouldn't be wrong.

Merriam-Webster Unabridged does not flag hitherto as "archaic."

Macmillan does mark hithertho as "very formal" but it's by no means outdated.

Whoever marked you down for using an "archaic" word is wrong (unless perhaps you were using hitherto in an informal context).

(Disclaimer: I read enough fantasy literature that hitherto seems rather ordinary to me.)