noun
childishness
CHYLD-ihsh-nuhs
noun
1
Immature behavior or an immature way of acting.
"His childishness during the negotiation frustrated everyone at the table."
How to Use Childishness
Learner’s notesIn plain EnglishThe quality of acting immaturely, like a child, in a way that's usually seen as unfitting for an adult.
Word Forms
childishnesses plural
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His _____ during the negotiation frustrated everyone at the table.
Etymology
Formed from "childish" plus the noun-forming suffix -ness.