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Adjective: speculative  spe-kyu-lu-tiv
  1. Not financially safe or secure
    "speculative business enterprises";
    - bad, risky, high-risk
  2. Not based on fact or investigation
    "speculative knowledge";
    - notional
  3. Showing curiosity
    "raised a speculative eyebrow";
    - inquisitive, questioning, wondering

See also: curious, theoretic, theoretical, unsound

Encyclopedia: Speculative