20 entries under spreading topic. ×

19
contagious(adjective, move, unhealthy, widespread, fatal)
12
communicable(adjective, move, able, taking, deadly)
12
infective(adjective, taking, catching, poisonous)
11
toxic(adjective, unclean, catching)
7
epidemic(noun, adjective, widespread, catching, wide-ranging)
6
noxious(adjective, catching)
6
pestilent(adjective, dangerous, catching, transferable)
5
pestilential(adjective, catching)
5
transmittable(adjective, taking, deadly, catching, poisonous)
4
virulent(adjective, catching)
4
corrupting(adjective, catching)
4
miasmic(adjective, catching, transferable, communicable)
3
diseased(adjective, catching)
3
mephitic(adjective, catching)
2
contaminating(adjective, catching)
1
transferable(adjective, taking, catching, communicable)
1
vitiating(adjective, catching)
0
defiling(adjective, catching)
0
poisoning(adjective, catching)
0
polluting(adjective, catching)
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APASmart Define. (2015). infectious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/infectious/thesaurus/synonyms
ChicagoSmart Define. 2015. "infectious thesaurus" https://smartdefine.org/infectious/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, infectious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/infectious/thesaurus/synonyms>.
MLASmart Define. "infectious thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/infectious/thesaurus/synonyms>