Puerile (adjective)

Childish or immature, particularly in terms of behavior or thought.

Origin:

Late 16th century: from latin puerilis "of a boy", from puer "boy".

Examples:

1. The movie was criticized for its puerile humor and lack of substance.
2. He was criticized for his puerile behavior, as he acted like a child and was not able to take responsibility for his actions.
3. The prank was considered puerile and not at all funny.
4. His puerile attitude was a source of frustration for his colleagues, who found it hard to take him seriously.
5. The book was criticized for its puerile writing style and lack of literary merit.