How to say "hypothetical" in Japanese

Choosing the right word
  • 仮言的かげんてき
    na-adjectiveA technical term from logic, covering 'hypothetical' in the sense of conditional, if–then propositions; it appears in logic and philosophy writing and is seldom the right word for everyday hypothetical scenarios.
  • 仮定的かていてき
    na-adjectiveThe choice for 'hypothetical' in its ordinary sense of something assumed or supposed rather than actual, as in a hypothetical question or scenario; it also covers the senses 'theoretical' and 'presumptive'.

For 'hypothetical' in the ordinary sense of assumed or supposed, 仮定的 is the word; 仮言的 is logic terminology for hypothetical conditional (if–then) propositions — both are less common choices.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

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