5
atrociously
4
awfully
4
terribly
3
abominably
2
abysmally
2
awful
2
badly
2
corruptly
2
foully
2
lousily
2
miserably
2
nastily
2
outrageously
2
putridly
2
rancidly
2
unsoundly
1
addly
1
contemptibly
1
decadently
1
degenerately
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APASmart Define. (2013). rottenly thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/rottenly/thesaurus/synonyms
ChicagoSmart Define. 2013. "rottenly thesaurus" https://smartdefine.org/rottenly/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, rottenly thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/rottenly/thesaurus/synonyms>.
MLASmart Define. "rottenly thesaurus" 17 June 2013. Web. 20 September 2026. <https://smartdefine.org/rottenly/thesaurus/synonyms>