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HYPHEN
WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS
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WORDNET DICTIONARY

Adverbial unfortunately has 1 sense

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

OXFORD DICTIONARY

THESAURUS

unfortunately

by ill hap, by ill luck, impolitically, impoliticly, in adverse circumstances, inadvisably, inappropriately, inaptly, inauspiciously, incongruously, inconveniently, ineptly, inexpediently, infelicitously, inopportunely, sadly, undesirably, unfavorably, unfittingly, unhappily, unluckily, unpromisingly, unpropitiously, unprovidentially, unseasonably, unsuitably

ROGET THESAURUS

unfortunately

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 "unfortunately" in Webster Dictionary Online