- Definitions|1
- Thesaurus|208
- Abbreviations|0
| undisciplined | |
| unethical(wicked, immoral, deceitful, fickle, untrustworthy) | |
| unfilial | |
| unpatriotic(fickle, untrustworthy, unprincipled, dirty-dealing) | |
| unreligious | |
| unruly | |
| violative | |
| wicked(adjective, vice) | |
| willful | |
| adulterine(fickle, untrustworthy, unprincipled, dirty-dealing) | |
| adulterous(fickle, untrustworthy, unprincipled, dirty-dealing) | |
| amoral(fickle, untrustworthy, unprincipled, dirty-dealing) | |
| bad | |
| badly behaved | |
| betraying(adjective, untrue, treacherous, disloyal, traitorous) | |
| bigamous(fickle, untrustworthy, unprincipled) | |
| changeful(fickle, untrustworthy, unprincipled, dirty-dealing) | |
| committing perjury(expression, fickle, untrustworthy, unprincipled, dirty-dealing) | |
| contumacious | |
| delinquent |
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| APA | Smart Define. (2015). undutiful thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/undutiful/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "undutiful thesaurus" https://smartdefine.org/undutiful/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, undutiful thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/undutiful/thesaurus/synonyms>. |
| MLA | Smart Define. "undutiful thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/undutiful/thesaurus/synonyms> |