Etymology
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unlucky (adj.)

1520s, "marked by misfortune or failure," from un- (1) "not" + lucky (adj.). Similar formation in West Frisian unlokkich, Mliddle Low German unluckich. Sense of "boding ill" is recorded from 1540s; that of "having bad luck" is from 1550s; that of "bringing bad luck" is from 1580s. Related: Unluckily; unluckiness.

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Definitions of unlucky

unlucky (adj.)
having or bringing misfortune;
Friday the 13th is an unlucky date
Synonyms: luckless
unlucky (adj.)
marked by or promising bad fortune; "the unlucky prisoner was again put in irons"- W.H.Prescott;
Synonyms: doomed / ill-fated / ill-omened / ill-starred
From wordnet.princeton.edu