IMMATURITY
immaturity, immatureness
(noun) not having reached maturity
Source: WordNet® 3.1
Noun
immaturity (countable and uncountable, plural immaturities)
Youth; the condition of being immature or not fully grown
Antonyms
• maturity
Source: Wiktionary
Im`ma*tu"ri*ty, n. Etym: [L. immaturitas: cf. F. immaturité.]
Definition: The state or quality of being immature or not fully developed;
unripeness; incompleteness.
When the world has outgrown its intellectual immaturity. Caird.
Source: Webster’s Unabridged Dictionary 1913 Edition