Now, follow in your books and repeat after me as we learn four new words in English:

puerile: adj. 1: Juvenile 2: childish, silly.

puerilism n. C childish behavior, esp. as a symptom of mental disorder.

vacuous: adj. :1:emptied of or lacking content. 2: marked by lack of ideas or intelligence : stupid : inane

nugatory adj. : of little or no consequence: trifling: inconsequential