3
primitive(adjective, crude, barbaric)
2
arrested(adjective, dull, backward, undeveloped)
2
behindhand
2
callow(inexperienced, young, childish, undeveloped, unformed)
2
childish(inexperienced, young, undeveloped, unformed)
2
crude(simple, basic, inexperienced, unsophisticated, young)
2
defective
2
dense
2
feeble(adjective, weak, tiny)
2
green(adjective, inexperienced, young, childish, undeveloped)
2
inchoate(adjective, developed)
2
incomplete
2
jejune(inexperienced, young, childish, undeveloped, unformed)
2
latent(adjective, hidden, dormant)
2
peewee(adjective, weak, feeble, little, tiny)
2
poor(adjective, backward)
2
retarded(impulsive, impractical, half-baked, doomed, unplanned)
2
unfinished(inexperienced, young, childish, undeveloped, unformed)
2
unfledged(adjective, inexperienced, young, childish, undeveloped)
2
unprogressive
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APASmart Define. (2015). underdeveloped thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/underdeveloped/thesaurus/synonyms
ChicagoSmart Define. 2015. "underdeveloped thesaurus" https://smartdefine.org/underdeveloped/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, underdeveloped thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/underdeveloped/thesaurus/synonyms>.
MLASmart Define. "underdeveloped thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/underdeveloped/thesaurus/synonyms>