2
uncalculated(adjective, unintentional, unintended)
2
unimportant
2
unneeded
2
unpredictable
2
unpremeditated(adjective, chance, haphazard, unplanned, accidental)
1
accessorial
1
acquired
1
advantageous(happy, fortunate, opportune, blessed, fluky)
1
adventitial
1
adventive
1
alien
1
all systems go(expression, idiom, happy, fortunate, opportune)
1
appurtenant
1
arbitrary
1
auspicious(happy, fortunate, opportune, blessed, fluky)
1
benefical
1
beneficial(happy, fortunate, opportune, blessed, fluky)
1
benign(happy, fortunate, opportune, blessed, fluky)
1
blessed(happy, fortunate, opportune, fluky)
1
chancy
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APASmart Define. (2015). adventitious thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/adventitious/thesaurus/synonyms
ChicagoSmart Define. 2015. "adventitious thesaurus" https://smartdefine.org/adventitious/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, adventitious thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/adventitious/thesaurus/synonyms>.
MLASmart Define. "adventitious thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/adventitious/thesaurus/synonyms>