1.
logic, reasoning, theory
The principles or reasoning behind something.
理屈は分かるけど...。
I understand the logic, but...
理屈では分かっていても、なかなか実行できない。
Even though I understand it in theory, I can't easily put it into practice.
その理屈は正しいと思う。
I think that reasoning is correct.
2.
excuse, argument (negative connotation)
Used negatively to describe someone who argues too much or makes excuses.
理屈を言うな。
Don't argue. / Don't make excuses.
Negative usage
理屈っぽい人だ。
They're an argumentative person.
理屈ばかり言っていないで、早くやりなさい。
Stop just making excuses and do it already.
Can be neutral (logic/reasoning) or negative (excessive argumentation).
COMMON PATTERNS:
- 理屈を言う (to argue, make excuses)
- 理屈っぽい (argumentative, nitpicky)
- 理屈に合う (make sense, be logical)
- 理屈では (in theory)
- 理屈抜きで (without reasoning, intuitively)
SIMILAR WORDS:
- 論理 - logic (more formal/academic)