Senselessness is a related term of childishness.
As nouns the difference between senselessness and childishness
is that senselessness
is the state of being senseless; unsense while childishness
is (uncountable) the state or characteristic of being childish.
The state of being senseless; unsense.
* November 2 2014 , Daniel Taylor, "
Sergio Agüero strike wins derby for Manchester City against 10-man United," guardian.co.uk
- They had contributed heavily to their own downfall, most glaringly with the senselessness of Chris Smalling’s red card, and they should know by now that Manuel Pellegrini’s team are not the kind of opponents to pass up these kind of handouts.
(uncountable) The state or characteristic of being childish.
(countable) Childish behaviour.