spéculatives

In a sentence

• Les théories spéculatives sur l'origine de l'univers sont fascinantes.

  Speculative theories about the origin of the universe are fascinating.

  Here, 'spéculatives' is used as an adjective to describe theories that are based on speculation or theoretical reasoning rather than empirical evidence.

• Investir dans des actions spéculatives peut être risqué.

  Investing in speculative stocks can be risky.

  In this sentence, 'spéculatives' describes stocks that are volatile and involve a high degree of risk due to their speculative nature.

• Elle a proposé une idée spéculative qui pourrait résoudre le problème.

  She proposed a speculative idea that might solve the problem.

  Here, 'spéculative' is used to characterize an idea that is uncertain and based on conjecture, suggesting it is a preliminary or tentative proposal.