2
elective
2
instinctive(adjective, simple, natural, casual, impulsive)
2
intended(adjective, free, deliberate, natural, willing)
2
optional(adjective, free, deliberate, natural, willing)
2
unbid
2
uncalled
2
uncalled-for(adjective, willing, arrogant, voluntary, unwelcome)
2
undesirable
2
undesired(adjective, willing, arrogant, voluntary, unwelcome)
2
volunteer(adjective, free, deliberate, natural, willing)
2
willful(adjective, free, keen, happy, agreeable)
1
accommodating(adjective, keen, happy, agreeable, enthusiastic)
1
active(adjective, keen, happy, agreeable, enthusiastic)
1
ad-lib(adjective, simple, natural, casual, impulsive)
1
agreeable(adjective, keen, happy, enthusiastic, ready)
1
amenable(adjective, keen, happy, agreeable, enthusiastic)
1
arbitrary
1
autocratic
1
autonomic
1
break loose(expression, adjective, simple, natural, casual)
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APASmart Define. (2015). unbidden thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unbidden/thesaurus/synonyms
ChicagoSmart Define. 2015. "unbidden thesaurus" https://smartdefine.org/unbidden/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, unbidden thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unbidden/thesaurus/synonyms>.
MLASmart Define. "unbidden thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/unbidden/thesaurus/synonyms>