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infantile

adjective

/ˈɪnfəntaɪl/

Meaning

characteristic of an infant; childish

His infantile behavior embarrassed everyone at the meeting.

childish, immature, juvenile, babyish

mature, adult, grown-up

infantile behavior, infantile disease, infantile reaction

lasting; permanent; continuing for a long time

Having or showing a strong desire for revenge.

complete and utter; very steep or transparent

showing keen interest; enthusiastic; having or showing desire and excitement

having sharp judgment and practical intelligence

impossible to understand or measure; very deep