109 entries under irregular topic. ×

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devious(unpredictable, unreliable)
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dicey(unpredictable, unreliable, fanciful, quirky)
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directionless(unpredictable, unreliable)
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fitful(unpredictable, unreliable, rare, uncommon)
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fluctuant(unpredictable, unreliable)
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heteromorphic(strange, exceptional, nonstandard, uncharacteristic)
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iffy(unpredictable, unreliable)
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incalculable(unpredictable, unreliable)
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inconstant(adjective, uncertain, unstable, unpredictable)
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malformed(nonstandard, uncharacteristic)
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meandering(unpredictable, unreliable)
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mercurial(unpredictable, unreliable)
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nomadic(unpredictable, unreliable)
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planetary(unpredictable, unreliable)
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rambling(unpredictable, unreliable)
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random(chance, detached, remote, lonely)
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roving(unpredictable, unreliable)
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shifting(unpredictable, unreliable)
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spastic(strange, exceptional, nonstandard, uncharacteristic)
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stray(odd, unpredictable, unreliable, rare)
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APASmart Define. (2016). unusual thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unusual/thesaurus/synonyms
ChicagoSmart Define. 2016. "unusual thesaurus" https://smartdefine.org/unusual/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, unusual thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unusual/thesaurus/synonyms>.
MLASmart Define. "unusual thesaurus" 31 March 2016. Web. 28 September 2026. <https://smartdefine.org/unusual/thesaurus/synonyms>