16
strictly(adverb, severely)
10
grimly(adverb, severely)
9
severely(adverb, fast, just, absolutely, sprightly)
8
precisely(adverb, severely, thoroughly, fully, completely)
7
exactly(adverb, just, thoroughly, fully, closely)
7
meticulously(adverb, severely, thoroughly, fully, precisely)
7
scrupulously(adverb, absolutely, thoroughly, fully, correctly)
6
accurately(adverb, fastidiously)
6
correctly(adverb, severely, really, thoroughly, fully)
6
exactingly(adverb, severely, fastidiously)
6
harshly(adverb, severely)
6
rigidly
6
sternly(adverb, severely)
5
austerely(adverb, severely)
5
carefully(adverb, fastidiously)
5
conscientiously(adverb, severely, thoroughly, fully, precisely)
5
dourly(adverb, severely)
5
intensely(adverb, fast, sprightly, severely, seriously)
5
particularly(adverb, absolutely, thoroughly, fully, completely)
5
stringently(adverb, severely)
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APASmart Define. (2015). rigorously thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rigorously/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigorously thesaurus" https://smartdefine.org/rigorously/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, rigorously thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rigorously/thesaurus/synonyms>.
MLASmart Define. "rigorously thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/rigorously/thesaurus/synonyms>