regrettably

from WordNet (r) 3.0 (2006)
regrettably
    adv 1: by bad luck; "unfortunately it rained all day"; "alas, I
           cannot stay" [syn: {unfortunately}, {unluckily},
           {regrettably}, {alas}] [ant: {as luck would have it},
           {fortuitously}, {fortunately}, {luckily}]
    

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