Logic
Reasoning, Argument
noun
Reason yields to logic and more reasoning.
理屈 can be neutral, but it often has negative connotations too, like when it refers to an argument that contains questionable logic, pretexts, or too much pedantry.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
現実には理屈だけじゃ通用しないことは山ほどある。
In reality, there are many things where logic alone will not work.
ホッケーは理屈抜きで好きなんです。
I like hockey without reason.
理屈で分かっていても、実際にやってみると難しいことってたくさんありますよね？
There are many things that you understand logically, but are difficult when you actually try to do them, right?
小難しい理屈ばっかりこねて、本当に嫌な人ね。
You're always overcomplicating things with your fancy reasoning; you're quite obnoxious.