the way something is with respect to its main attributes

not yet mature

characteristic of a lack of maturity

not fully developed or mature; not ripe

(used of living things especially persons) in an early period of life or development or growth

the state of not being ripe

lacking and evidencing lack of experience of life

the state of being premature

in the state that someone is in between puberty and adulthood

the state of a child between infancy and adolescence