25 entries under harmful topic. ×

14
deadly(adjective, help, unhealthy, dangerous)
10
pestiferous(adjective, dangerous, fatal, poisonous)
8
poisonous(adjective, unhealthy, deadly, fatal)
7
lethal(adjective, dangerous, deadly, fatal)
7
unhealthy(adjective, unhealthy, diseased, unwholesome)
4
deleterious(adjective, dangerous, fatal, poisonous)
4
hurtful(adjective, poisonous, toxic)
4
injurious(adjective, unhealthy, dangerous, fatal)
4
insalubrious(adjective, unhealthy, poisonous, toxic)
4
noisome(poisonous, toxic, insalubrity)
4
unwholesome(adjective, unhealthy, poisonous, virulent)
4
venomous(adjective, unhealthy, fatal, unwholesome)
3
destructive(adjective, unhealthy, dangerous, fatal)
3
detrimental(adjective, dangerous, poisonous, toxic)
3
toxic(adjective, unhealthy, fatal, unwholesome)
2
corrupting(adjective, dangerous, catching, poisonous)
2
sickly(adjective, diseased, poisonous, toxic)
1
dangerous(fatal, poisonous, toxic, lethal)
1
foul(poisonous, toxic)
1
insalutary(poisonous, toxic)
<12>
11 years ago|7.7k views|share |citing 
APASmart Define. (2015). pestilent thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/pestilent/thesaurus/synonyms
ChicagoSmart Define. 2015. "pestilent thesaurus" https://smartdefine.org/pestilent/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, pestilent thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/pestilent/thesaurus/synonyms>.
MLASmart Define. "pestilent thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/pestilent/thesaurus/synonyms>