1. increasingly advancing in amount or intensity
  2. incredulous not disposed or willing to believe; unbelieving
  3. increasing monotonic consistently increasing
  4. increasing becoming greater or larger
  5. necklace poplar a common poplar of eastern and central United States
  6. unceasingly without stopping
  7. incredible amazing; extraordinarily good or great
  8. incredulously in a disbelieving manner
  9. crossing over the interchange of sections between pairing homologous chromosomes during the prophase of meiosis
  10. gray poplar large rapidly growing poplar with faintly lobed dentate leaves grey on the lower surface; native to Europe but introduced and naturalized elsewhere
  11. grey poplar large rapidly growing poplar with faintly lobed dentate leaves grey on the lower surface; native to Europe but introduced and naturalized elsewhere
  12. encouragingly in an encouraging manner
  13. inquiringly in an inquiring manner
  14. Western balsam poplar cottonwood of western North America with dark green leaves shining above and rusty or silvery beneath
  15. ungrudgingly in a generous and ungrudging manner
  16. incredibly exceedingly; extremely
  17. entreatingly in a beseeching manner
  18. engrossing capable of arousing and holding the attention
  19. aspen poplar a poplar that is widely cultivated in the United States
  20. incremental cost the increase or decrease in costs as a result of one more or one less unit of output