44
unfortunately(adverb, regret, sadly, unhappily, alas)
12
alas(adverb, unfortunately, unhappily, unluckily, with sadness)
11
sadly(adverb, gloomily, miserably, unfortunately, alas)
11
unluckily(adverb, gloomily, miserably, unfortunately, unhappily)
9
lamentably(adverb, gloomily, miserably, unfortunately, by bad luck)
8
grievously(adverb, by bad luck, cause great distress)
8
unhappily(adverb, gloomily, miserably, unfortunately, drearily)
6
woefully(adverb, with sadness, cause great distress)
4
deplorably(adverb, cause great distress)
3
regretfully(adverb, alas)
2
miserably(adverb, by bad luck)
2
pitiably
2
sad to relate(adverb, with sadness)
1
acutely
1
afraid
1
badly
1
critically
1
dangerously
1
decidedly
1
deplorable
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APASmart Define. (2015). regrettably thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/regrettably/thesaurus/synonyms
ChicagoSmart Define. 2015. "regrettably thesaurus" https://smartdefine.org/regrettably/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, regrettably thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/regrettably/thesaurus/synonyms>.
MLASmart Define. "regrettably thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/regrettably/thesaurus/synonyms>