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Adjective: suspensive  su'spen-siv
  1. (of a situation) characterized by or causing suspense
    "They reached a suspensive conclusion";
    - cliff-hanging, suspenseful, nail-biting
     
  2. Undecided or characterized by indecisiveness
    "The jury remained in a suspensive state, unable to reach a verdict"

See also: dithery [informal], indecisive, tense