118 entries under adjective topic. ×

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illegitimate
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incapable(weak, inadequate, incompetent, inept)
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incapacitated(weak, inadequate, incompetent, inept)
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ineffectual(weak, inadequate, incompetent, inept)
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inefficient
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inept(weak, inadequate, incompetent, helpless)
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infecund(weak, inadequate, incompetent, inept)
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infertile
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infirm(weak, inadequate, incompetent, inept)
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inoperable
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insincere
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kaput
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light
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malfunctioning
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nerveless(weak, inadequate, incompetent, inept)
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non-functioning
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nugatory
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paper tiger(expression, weak, inadequate, incompetent)
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paralyzed(weak, inadequate, incompetent, inept)
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phoney orphony
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APASmart Define. (2015). dud thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/dud/thesaurus/synonyms
ChicagoSmart Define. 2015. "dud thesaurus" https://smartdefine.org/dud/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, dud thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/dud/thesaurus/synonyms>.
MLASmart Define. "dud thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/dud/thesaurus/synonyms>