noun, plural im·ma·tu·ri·ties for 2.
- a state or condition of being immature: the immaturity of one’s behavior; the immaturity of a country’s technology.
- an immature action or attitude.
1530s, “untimeliness,” from Latin immaturitatem (nominative immaturitas) “unripeness,” from immaturus (see immature). Meaning “lack of maturity” attested from c.1600.