Infantile learner withdrawn from cool course

• Briefly refrigerate babe? That's immature
• Mostly cold item on menu suitable for a youngster
• Immature
• Almost cool meal suitable for infants
• Puerile

Wiktionary Word definitions in Wiktionary
a. 1 Of or suitable for a child. 2 Behaving immaturely.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
adjective COLLOCATIONS FROM CORPUS ■ NOUN things ▪ It was time to put away childish things . ▪ When I was a child, my speech, my outlook, and my thoughts were all with childish things . EXAMPLES FROM OTHER ENTRIES ▪ He said he wouldn't go out with us if ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
Old English cildisc "proper to a child;" see child + -ish . Meaning "puerile, immature, like a child" in a bad sense is from early 15c. Related: Childishly ; childishness .

Wikipedia Word definitions in Wikipedia
Childish can refer to: Being like a child English writer and musician Billy Childish Rapper Childish Gambino Act of being petty