IPA: /ʌnˈlʌkɪəst/
KK: /ʌnˈlʌkɪst/
The person or thing that has the most bad luck compared to others.
He was the unluckiest player in the tournament, losing every game he played.
Comparative: more unlucky
Superlative: unluckiest
Unluckiest → It is formed from "un-" (meaning not) and "lucky" (from Middle English *lucki*, meaning fortunate) and the superlative suffix "-est" (meaning most). The word "unluckiest" means the most unfortunate or the one who has the least luck.
Think of 'not' ('un-') being added to 'fortunate' ('lucky') to describe someone who is the 'most' ('-est') unfortunate.
No commonly confused words.