
entwickelt
developed
At a high level of technical, economic, or social development. Often used for countries or industries.
Japan ist ein hoch entwickeltes Industrieland.
Japan is a highly developed industrialized country.
developed
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developed
At a high level of technical, economic, or social development. Often used for countries or industries.
Japan ist ein hoch entwickeltes Industrieland.
Japan is a highly developed industrialized country.

mature
Advanced in personal or intellectual maturity. Describes a person who is mature or wise for their age or situation.
Für ihr Alter ist sie schon sehr weit entwickelt und versteht komplexe Zusammenhänge.
For her age, she is already very mature and understands complex connections.

developed
In biology, having reached a stage of full growth or formation.
Die voll entwickelte Raupe verpuppt sich bald.
The fully developed caterpillar will soon pupate.
'Entwickelt' (developed) is the past participle of the verb 'entwickeln' (to develop) and is used here as an adjective. It describes a state that is the result of a process of development.
Die Software ist noch nicht voll entwickelt und hat einige Fehler.
The software is not yet fully developed and has some bugs.
The adjective 'entwickelt' (developed) is very often specified more closely by adverbs that indicate the degree of development. Typical combinations are 'hoch entwickelt' (highly developed), 'weit entwickelt' (well advanced), 'gut entwickelt' (well developed), or 'voll entwickelt' (fully developed).
Singapur ist ein wirtschaftlich hoch entwickeltes Land.
Singapore is an economically highly developed country.
In the context of countries or the economy, people often speak of 'hoch entwickelten Industrieländern' (highly developed industrialized countries), 'technisch entwickelten Gesellschaften' (technically developed societies), or a 'gut entwickelten Infrastruktur' (well-developed infrastructure).
Die Region hat eine sehr gut entwickelte Tourismusbranche.
The region has a very well-developed tourism industry.
When 'entwickelt' (developed) describes a person, it refers to intellectual or social maturity. It is often used with the addition 'für sein/ihr Alter' (for his/her age).
Er ist für sein Alter schon sehr weit entwickelt und sehr verantwortungsbewusst.
For his age, he is already very mature and very responsible.
ripe / mature
When referring to a person, reif (mature) and entwickelt (developed) can both express personal or intellectual progress. Reif particularly describes adult and sensible behavior, whereas entwickelt more generally refers to an advanced stage of personal or intellectual development.

Obwohl Mia erst sechzehn ist, ist sie geistig schon weit entwickelt.
Although Mia is only sixteen, she is already intellectually very mature.
Obwohl Mia erst sechzehn ist, reagiert sie in schwierigen Gesprächen sehr reif.
Although Mia is only sixteen, she reacts very maturely in difficult conversations.