adjective
pertaining to, characterized by, or given to speculation, conjecture, or supposition
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The investment in the new technology is purely speculative and may not yield any returns.
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I wouldn't invest in that stock, it's too speculative and risky.
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I'm not into all that speculative stuff, I prefer to play it safe with my investments.
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His speculative theories about the origins of the universe are fascinating but unproven.