効 果(こうか)

こうか

noun

effect, result, effectiveness

See also: 高価(こうか) (expensive), 硬貨(こうか) (coin)

1. effect, result

The outcome or result of an action.

効果(こうか)がない。

It has no effect.

薬(くすり)の効果(こうか)が出(で)てきた。

The medicine is starting to take effect.

この運動(うんどう)を続(つづ)ければ、ダイエットの効果(こうか)が出(で)るはずだ。

If you keep up this exercise, you should see results from the diet.

2. effectiveness, efficacy

The degree to which something produces the desired result.

効果(こうか)的(てき)な方法(ほうほう)

An effective method.

この薬(くすり)はとても効果(こうか)的(てき)だ。

This medicine is very effective.

効果(こうか)的(てき)に勉強(べんきょう)するには、まず計画(けいかく)を立(た)てることが大切(たいせつ)だ。

To study effectively, the first important thing is to make a plan.

効果(こうか) means effect, result, or effectiveness. Used broadly for the outcomes of actions, treatments, policies, and methods.

Common patterns

効果(こうか)がある: to have an effect
効果(こうか)が出(で)る: the effect appears/shows
効果(こうか)がない: to have no effect
効果(こうか)的(てき)（な）: effective
効果(こうか)的(てき)に: effectively

Compounds

逆(ぎゃく)効果(こうか): counterproductive effect, backfire
相乗(そうじょう)効果(こうか): synergistic effect
副作用(ふくさよう): side effect
温室(おんしつ)効果(こうか): greenhouse effect
音響(おんきょう)効果(こうか): sound effects

Similar words

結果(けっか): result, outcome (neutral — what happened)
効果(こうか): effect (implies intended or desired result)
影響(えいきょう): influence, impact (broader, can be positive or negative)

Related Words

Synonym: 結果(けっか) (result, outcome)

Synonym: 影響(えいきょう) (influence, impact)

Compare: 即効(そっこう) (immediate effect)

Compare: 効(き)き目(め) (effect)

Compare: 薬効(やっこう) (medicinal effect)

general

Added 2026.1.11 16:28 · Revised 2026.9.2 12:02

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