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Definition of Regrettably
1. Adverb. By bad luck. "Alas, I cannot stay" 
Exact synonyms: Alas, Unfortunately, Unluckily
Partainyms: Regrettable, Unfortunate, Unlucky
Antonyms: Fortunately, Luckily
Partainyms: Regrettable, Unfortunate, Unlucky
Antonyms: Fortunately, Luckily
Definition of Regrettably
1. [adv]



