無駄(むだ)

むだ
na-adjective
useless, wasteful
abstract
1. useless, wasteful, futile
Something that serves no purpose or achieves nothing.
Don't waste time.
それは無駄(むだ)だと思(おも)う。
I think that's useless.
無駄(むだ)な努力(どりょく)だった。
It was a wasted effort.
2. waste
As a noun, something that is wasted or unnecessary.
I want to reduce food waste.
I decided to review my monthly expenses and eliminate waste.

無駄(むだ) describes something that serves no useful purpose or yields no result. It functions as both a na-adjective and a noun.

Common patterns

Compounds

Usage

Often used with をする for wasteful action or になる when something turns out to be pointless: せっかくの努力(どりょく)が無駄(むだ)になった (all that effort went to waste).