na-adjective
simplistic; hasty; jumping to conclusions
Describes thinking or ideas that are overly simplistic, ignoring complexity, or reaching a conclusion too quickly without proper consideration. Often carries a negative connotation.
彼の短絡的な考え方には驚かされる。
I'm amazed at his simplistic way of thinking.
そんな短絡
You shouldn't jump to such a hasty conclusion.
早計 means 'premature' or 'rash' and focuses on the timing of a decision, whereas 短絡的 emphasizes the simplistic reasoning behind it.
From 短絡 (short circuit) + 的 (-like). The figurative sense of 'simplistic' derives from the idea of a mental 'short circuit' that bypasses careful thought.