1. unluck

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Is this word correct?
I cannot find the word 'unluck' except Wiktionary. I know the opposite of luck is either bad luck or ill luck or misfortune. What about the following?

[Wiktionary]
unluck (uncountable)
1. Absence or lack of luck; lucklessness; bad luck; misfortune. [quotations ▼]

There’s no such word as ‘unluck’ — sorry!

Unlucky
Bad luck
Out of luck

Here's the best place to find synonyms and antonyms. What you were looking for is an antonym for "luck."

http://www.thesaurus.com/browse/luck?s=t
At first they list the synonyms for the word. You'll need to scroll down for antonyms.

Just because I was "wrong," doesn't mean you have to delete my post trying to help rfvv. Jerk!

Unluck [Urban Dictionary Definition]

Unluck generally means unlucky, though isn't said in the same way. It's normally just an outburst.
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Why is 'unluck' used this way? Do some people use unluck as unlucky?

The word "unluck" is not commonly used in English and is not widely recognized. However, it appears to be listed in Wiktionary as a noun meaning "absence or lack of luck; lucklessness; bad luck; misfortune." Since it is not a commonly used word, you might encounter difficulties in finding it in regular dictionaries or in everyday conversation.

If you want to refer to the opposite of luck, there are more commonly used phrases such as "bad luck," "ill luck," or "misfortune" that would convey the same meaning. It is always a good idea to use the most widely recognized and commonly understood terms when expressing yourself in English.