1. uncheerful causing sad feelings of gloom and inadequacy
  2. incredulous not disposed or willing to believe; unbelieving
  3. vinegar fly flies whose larvae feed on pickles and imperfectly sealed preserves
  4. inaugural occurring at or characteristic of a formal induction
  5. ungrateful not feeling or showing gratitude
  6. ungracefully without grace; rigidly
  7. ungratefully in an ungrateful manner
  8. ungraceful lacking grace; clumsy
  9. uncurl move out of a curled position
  10. unique the single one of its kind
  11. airflow the flow of air
  12. incurable incapable of being remedied
  13. incredible amazing; extraordinarily good or great
  14. incorrigible impervious to correction by punishment
  15. air flow the flow of air
  16. necrophilia an irresistible sexual attraction to dead bodies
  17. inaugurally so as to inaugurate
  18. incurably in a manner impossible to cure
  19. uncordial lacking warmth or friendliness
  20. uniquely so as to be unique