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Unfortunate

/ʌnˈfɔːtʃənət/

Used to describe a situation or event that is unlucky or regrettable.

Synonyms:

It's unfortunate we couldn't go to the party.It was an unfortunate time to spill the drinks.

From Latin un- meaning not and fortunatus, past participle of fortuna, meaning fate or luck, first used in the 14th century.

14 mentions per 1 million words

Moderate

Hint: Frequency according to COCA