" unformed "

1: having no definite or recognizable form;

  * e.g., " ... what was once an unformed lump of clay is now an attractive, useful bowl "

•  Synonyms : 

•  amorphous,

•  formless,

•  shapeless,

•  unshaped,

•  unstructured

•  Antonyms : 

•  formed,

•  shaped,

•  shapen,

•  structured

2: lacking in adult experience or maturity;

  * e.g., " ... under his care and tutelage, young men, unformed in mind and body, became battle-worthy soldiers "

•  Synonyms : 

•  adolescent,

•  callow,

•  green,

•  immature,

•  inexperienced,

•  juvenile,

•  puerile,

•  raw,

•  unfledged,

•  unripe,

•  unripened

•  Antonyms : 

•  adult,

•  experienced,

•  grown-up,

•  mature,

•  ripe