well-developed

attributive

(attributive) developed to a great extent, highly developed

Japanese Meaning

高度に発達した / 十分に発展・成熟した

The city has a well-developed public transportation system.

その都市は公共交通システムが十分に発達している。

Sense（1）

(attributive) developed to a great extent, highly developed

He has well-developed muscles.

better-developed

（ comparative ）

best-developed

（ superlative ）