premature in WordNet English dictionary

1. born after a gestation period of less than the normal time
   "a premature infant"
   premature 
   
2. uncommonly early or before the expected time
   "illness led to his premature death"; "alcohol brought him to an untimely end"
   premature  untimely 
   
3. too soon or too hasty
   "our condemnation of him was a bit previous"; "a premature judgment"
   previous  premature