noun
empty theory; impractical theory
Refers to a theory or argument that is logically constructed but lacks practical applicability or real-world grounding. Often used in critical or dismissive contexts.
彼の提案は空理に過ぎない。
His proposal is nothing more than an empty theory.
その議論は空理空論で、現実的ではない。
That argument is just empty theory and impractical.