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.