Translation guide
The English word 'mechanical' has several distinct meanings. This guide helps learners choose the right Japanese expression depending on whether they mean 'related to machines', 'automatic/unthinking', or 'technical/physical'. Direct translation is often unnatural; context is key.
Describing something that involves, is part of, or is operated by a machine, or relating to the physical forces of mechanics.
The most common and neutral way to say 'mechanical' when referring to parts, devices, or systems that are machine-based. It literally means 'of a machine'.
この時計は機械の部品でできている。
This watch is made of mechanical parts.
It's due to a mechanical failure.
A more technical or formal adjective meaning 'mechanical' in the sense of relating to mechanics or machines. Often used in compound terms like 'mechanical engineering'.
彼は機械的な問題を解決した。
He solved the mechanical problem.
A loanword from English, used in specific contexts like 'mechanical keyboard' or product names. Not as common as native terms.
メカニカルキーボードが好きです。
I like mechanical keyboards.
Describing an action or response that is performed in a routine, unthinking manner, like a machine.
This is the primary translation for 'mechanical' in the sense of automatic, unthinking, or lacking emotion. It can describe actions, responses, or even a person's demeanor.
彼の返事は機械的だった。
His reply was mechanical.
機械的な作業は退屈だ。
Mechanical work is boring.
Literally 'without thinking', this phrase captures the unthinking aspect of 'mechanical' when describing how someone does something.
彼は考えずに作業を続けた。
He continued the work mechanically.
Means 'automatically', and can be used when the mechanical action is a habitual or reflexive response.
彼女は自動的に「はい」と言った。
She said 'yes' mechanically.
Pertaining to the branch of physics dealing with motion and forces.
The standard term for 'mechanical' in a physics context, as in 'mechanical energy' or 'mechanical principles'.
力学的エネルギーについて学んだ。
We learned about mechanical energy.
Also used in physics contexts, but '力学の' is more precise for the science itself.
機械的振動を測定する。
Measure mechanical vibrations.
In English, 'mechanical' can describe a person who is stiff or unemotional. In Japanese, using 機械的 for a person can sound overly critical or unnatural. Instead, describe the specific behavior, e.g., 無表情 (expressionless) or 冷たい (cold).
彼は無表情で話した。
He spoke in a mechanical way (expressionless).