Is it "'un-acknowledged" or "unacknowledged" or neither of these and there is no such word? (I'm trying to write an essay.) Thanks!

Yes, "unacknowledged" is a word.

http://www.thefreedictionary.com/unacknowledged

http://www.answers.com/topic/unacknowledged

essay writing

If i win one million dollars,I donate it to the orphanage essay include why I choose the orphanage.

The correct word is "unacknowledged." In this case, the prefix "un-" is added to the word "acknowledged" to indicate the absence of acknowledgement.

To determine if a hyphen is needed, you can refer to a reliable dictionary or style guide. In this case, the Merriam-Webster and Oxford dictionaries both list "unacknowledged" without a hyphen. So, "unacknowledged" is the correct spelling.

When you have questions about the spelling or usage of words, it's always a good idea to consult a trusted dictionary or a style guide, such as The Chicago Manual of Style or the Associated Press (AP) Stylebook. These resources provide guidance on spelling, hyphenation, punctuation, and other aspects of writing according to accepted standards.