B1 — Intermediateadjective
immaturo
immature, childish
Synonyms (≈ similar meaning)
infantilepuerileirresponsabileingenuoincosciente
Antonyms (≠ opposite meaning)
maturoresponsabileadultoassennatosaggio
Usage note
'Immaturo' is the direct psychological term. 'Infantile' and 'puerile' both mean childish (puerile is more literary/formal). 'Incosciente' emphasises recklessness. Note: 'immaturo' also means unripe for fruit, so context matters.
Example
"Il suo comportamento immaturo non è accettabile in un ambiente di lavoro."
"His immature behaviour is not acceptable in a work environment."
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