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ROGET THESAURUS

WORDNET DICTIONARY

Adverbial regrettably has 1 sense

• regrettably(r = adv.all) alas, unfortunately, unluckily - by bad luck; "unfortunately it rained all day"; "alas, I cannot stay"

ROGET THESAURUS

regrettably

Regret

N regret, repining, homesickness, nostalgia, mal du pays, maladie, lamentation, penitence, bitterness, heartburning, recrimination (accusation), laudator temporis acti, regretting, regretful, homesick, regretted, much to be regretted, regrettable, lamentable, regrettably, unfortunately, most unfortunately, Int, alas!, what a pity!, hang it!, 'tis pity, 'tis too true, sigh'd and look'd and sigh'd again, I'm sorry.

For further exploring for "regrettably" in Webster Dictionary Online