せいじゅく成熟seijuku
1.

The state in which fruits or grains have fully developed to a point where they are ready for consumption.

2.

A stage of human development where both the mental and physical aspects have evolved sufficiently to enable independent functioning.

3.

The appropriate timing at which circumstances align favorably for undertaking an action or decision.

Example:

進んで責任を取るということは成熟の印である。

せいじゅくき成熟期seijukuki
1.

The stage in an organism's life when it reaches full development and effectiveness, marked by the completion of physical growth and the ability to reproduce.

2.

The phase in personal or psychological development characterized by increased self-awareness, responsibility, and social understanding, often occurring during late adolescence to early adulthood.

3.

A transitional period in life, typically associated with the onset of puberty, where individuals begin to experience significant hormonal, emotional, and physical changes.

みせいじゅく未成熟miseijuku
1.

A state or condition characterized by a lack of full development or growth, often reflecting a stage before achieving maturity.

2.

The quality of being underdeveloped in emotional, social, or physical aspects, commonly associated with youth or early stages of life.

3.

A phase where someone or something has not yet reached their optimal or expected form, often resulting in limited abilities or insights.

4.

A period marked by naivety or inexperience, indicating a need for further education or personal growth.