If you describe someone or something as ~, you mean that they are in an early stage of development and not fully formed or matured. (FORMAL)
The market for which they are competing is still ~.
...the ~ minds of children.
= undeveloped
ADJ
If you describe someone or something as ~, you mean that they are in an early stage of development and not fully formed or matured. (FORMAL)
The market for which they are competing is still ~.
...the ~ minds of children.
= undeveloped
ADJ
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012