Synonyms for unfortunately

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1. To be regretted

   unluckily, regrettably, lamentably, unhappily, miserably, sadly, grievously, disastrously, dismally, calamitously, badly, dismayingly, sickeningly, discouragingly, catastrophically, horribly, if worst comes to worst.

   Antonyms happily*, favorably, prosperously.

2. With ill fortune

   by ill hap, by chance, accidentally, predestinately, as luck would have it, by an evil chance, perversely.