incomplete

/ˌɪnkəmˈpliːt/
adjective
  1. Not having all the necessary parts; not finished or whole.
    • She turned in an incomplete assignment and had to finish it over the weekend.
    • The puzzle was incomplete because three pieces were missing.
    • The historical record is incomplete, leaving many questions unanswered.
  2. Lacking something essential; not fully developed or realized.
    • Without the final chapter, the story feels incomplete.
    • The team's victory felt incomplete without their star player on the field.
    • His understanding of the topic is incomplete because he skipped the basic lessons.