Childishness
The Century Dictionary and Cyclopedia
noun.
The state or quality of being childish; puerility; simplicity; weakness of intellect: most frequently used in a disparaging sense.
the GNU version of the Collaborative International Dictionary of English
noun.
The state or quality of being childish; simplicity; harmlessness; weakness of intellect.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
The state of being
childish
.
noun.
Childish behaviour.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a property characteristic of a child