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childish (adj.)

Old English cildisc "proper to a child;" see child + -ish. Meaning "puerile, immature, like a child" in a bad sense is from early 15c. Similar formation in Old Saxon kindisc, Middle Dutch kintsch, Dutch kindsch, German kindisch. Related: Childishly; childishness.

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Definitions of childish from WordNet

childish (adj.)
indicating a lack of maturity;
childish tantrums
Synonyms: infantile
From wordnet.princeton.edu