the GNU version of the Collaborative International Dictionary of English
n. The state or quality of being childish; simplicity; harmlessness; weakness of intellect.
The Century Dictionary and Cyclopedia
n. The state or quality of being childish; puerility; simplicity; weakness of intellect: most frequently used in a disparaging sense.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a property characteristic of a child
Word Usage
"This is mostly childishness, which is, I suppose, morally culpable, although again I can't see that it should affect our estimation of whatever genuine insights and aesthetic achievements arise from their iconoclasm as artists."