childishness/ˈt͡ʃaɪld.ɪʃ.nəs/EtymologyFrom Middle English childishnes, childisnes, equivalent to childish + -ness.childishness means the state or characteristic of being childish. Lexicurio rates it Rare gem — a strength score of 81 out of 100.nounThe state or characteristic of being childish.Childish behaviour.“Exorcism, unction, the sign of the cross, holy water, infant-communion, and many other childishnesses, were also called "Apostolic institutions" — not at first, but long after they were invented, to conceal their real origin […]”