Unluckful
Without luck
My brother was unluckful when he didn't get ice cream for 35 years!
Unluck
Unluck generally means unlucky, though isn't said in the same way. It's normally just an outburst.
"Shit, I broke my leg."
"UNLUCK!"
"UNLUCK!"
Unlucks
A shortening and informal use of the word unlucky.
When you're about to win a victory royale in fortnite but get sniped by a 12 year old. "Damn man, that's unlucks."