well developed
A developed country has had modern industry, transport, etc. for some time and now bases much of its economy on services:
In developed countries, blood pressure tends to go up dramatically with age.
Job insecurity seems to be increasing across most of Western Europe, the United States and other parts of the developed world.
less developed nations

SMART Vocabulary: related words and phrases

Efficient and effective
be firing on all cylindersidiom
businesslike
clockwork
come together
cut through something
dispatch
do the trickidiom
ergonomic
ergonomically
ergonomics
high-functioning
hyper-efficient
seamless
seamlessly
smoothly
snappily
snappy
work wonders/miraclesidiom
workable
worth your saltidiom

You can also find related words, phrases, and synonyms in the topics:

Economics

developed | American Dictionary

developed
adjective
us/dɪˈvel·əpt/
stronger, larger, or more advanced:
Sharks have a highly developed sense of smell.
politics & government
Developed countries have a lot of industry and wealth.

developed | Business English

developed
adjective
uk /dɪˈveləpt/us
advanced or powerful:
Bolivia's energy sector is not as developed as that of Venezuela.
The electronics market here is far more developed than in any other Western country of comparable size.
ECONOMICS
having a lot of industrial activity and a strong economy:
Global deflation is squeezing profits and extinguishing jobs in the developed world.
Portable devices became big sellers in developed markets as music went digital.
Many companies in less developed regions are growing much faster than our own.
developed nations/economies
Compare