131 entries under adjective topic. ×

2
exhausting(harmful, damaging, fatal, mortal)
2
inimical(injurious, damaging, destructive, arouse bad feelings)
2
insalubrious
2
internecine(harmful, injurious, damaging, deadly)
2
malicious(bad, injurious, damaging, deadly)
2
nocuous(negative, distressing, harmful, injurious)
2
noisome(bad, evil, harmful, injurious)
2
pestilent
2
tempestuous(severe, harsh, intense, terrible)
2
unfavorable(bad, poor, awkward, inappropriate)
2
unfavourable
2
wrackful(harmful, injurious, damaging, deadly)
2
wreckful(harmful, injurious, damaging, deadly)
1
appalling
1
cutthroat(unpleasant, grim, harmful, injurious)
1
eradicative(harmful, injurious, damaging, deadly)
1
extirpative(harmful, injurious, damaging, deadly)
1
extravagant(devastating, disastrous)
1
fell(unpleasant, grim, harmful, injurious)
1
ferocious(severe, intense, unpleasant, grim)
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APASmart Define. (2016). ruinous thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/ruinous/thesaurus/synonyms
ChicagoSmart Define. 2016. "ruinous thesaurus" https://smartdefine.org/ruinous/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, ruinous thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/ruinous/thesaurus/synonyms>.
MLASmart Define. "ruinous thesaurus" 24 March 2016. Web. 26 September 2026. <https://smartdefine.org/ruinous/thesaurus/synonyms>