- Definitions|2
- Thesaurus|1.8k
- Abbreviations|0
| down(adjective, hard, evil, rough, nasty) | |
| exploiting(adjective, dishonest, immoral, rotten, untrustworthy) | |
| extortionate(adjective, dishonest, immoral, rotten, untrustworthy) | |
| false-principled | |
| falsified | |
| fast and loose(expression, adjective, idiom, dishonest, immoral) | |
| faulty | |
| fixed(adjective, dishonest, immoral, rotten, untrustworthy) | |
| flagitious | |
| foresworn(adjective, false, fickle, untrue, untrustworthy) | |
| formidable(adjective, hard, evil, rough, nasty) | |
| forsworn(adjective, mean, bad, base, false) | |
| gone to the dogs(expression, adjective, idiom, dishonest, immoral) | |
| hard(adjective, evil, rough, nasty, rude) | |
| hard-nosed(adjective, hard, evil, rough, nasty) | |
| hellish | |
| heretical | |
| hollow(wrong, false, dishonest, deceitful, incorrect) | |
| ignoble(adjective, hard, evil, rough, nasty) | |
| ill-natured(adjective, malevolent) |
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| APA | Smart Define. (2016). perfidious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/perfidious/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "perfidious thesaurus" https://smartdefine.org/perfidious/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2016, perfidious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/perfidious/thesaurus/synonyms>. |
| MLA | Smart Define. "perfidious thesaurus" 4 March 2016. Web. 24 September 2026. <https://smartdefine.org/perfidious/thesaurus/synonyms> |