
Underdeveloped
Growth Delay
Use to describe when someone or something hasn't reached expected maturity or progress.

He seems a bit underdeveloped for his age, physically and socially.
Negative Connotation
Can imply a lack or deficiency when referring to living organisms or their characteristics.

Her reading skills are underdeveloped, making schoolwork hard.
Compare with
EmergeImmatureIncipientIncompleteInfantileNascentRudimentaryUndeveloped
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