The state of immaturity suggests something that has not ripened or is not fully grown. Applied to humans, it is the state of being less than fully-grown, or at least of acting in a childish or silly manner.

With the Latin word immātūritās meaning "unripeness," as in a piece of fruit that is not yet fully developed, we can see the meaning of the modern word immaturity. Nowadays, the word is applied more often to people than to fruit, usually in referring to foolish behavior. Although the word is most often used to refer to adolescent behavior, it can still be applied to a physical state of development. And of course, it can still be applied to underripe produce.

Definitions of immaturity
  1. noun
    inappropriately childish behavior or manner
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    the behavior or manner expected of or appropriate to an adult
    type of:
    behavior, behaviour, conduct, demeanor, demeanour, deportment
    (behavioral attributes) the way a person behaves toward other people
  2. noun
    the state of not having reached maturity
    synonyms: immatureness
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    matureness, maturity
    state of being mature; full development
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    the state of not being ripe
    callowness, jejuneness, juvenility
    lacking and evidencing lack of experience of life
    prematureness, prematurity
    the state of being premature
    in the state that someone is in between puberty and adulthood
    childhood, puerility
    the state of a child between infancy and adolescence
    babyhood, infancy
    the earliest state of immaturity
    type of:
    the way something is with respect to its main attributes
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