Developed, progressed, evolved, advanced, grew,. See ‘meaning & use’ for definition, usage, and quotation evidence. Past simple and past participle of regress 2
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To return to a previous and less advanced or worse…
To return to a previous, usually worse or less developed state
When i left the country, my ability to speak the language regressed To have a tendency to approach or go back to a statistical. When people or things regress, they return to an earlier and less advanced stage of development .if your child regresses to babyish behaviour
[v + to/into] such countries are not 'developing' at. To revert to an earlier or less advanced state or form The act of going back The right to go back

To regress is to return to a former state or condition, and not usually in a good way
It often means relapse or get worse. first used in the late 14th century as a noun meaning act of going. The meaning of regress is an act or the privilege of going or coming back How to use regress in a sentence Simple past tense and past participle of regress
That has been subject to regression When the cured norman osborn suddenly regressed back to insanity, he came looking for parker To return to a previous and less advanced or worse state, condition, or way of behaving To return or revert , as to a former place, condition, or mode of behaviour | meaning, pronunciation, translations and examples in american english

[v + to/into] such countries are not 'developing'.
There is one meaning in oed's entry for the adjective regressed
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