How to say "diminish" in Japanese

Choosing the right word
  • 減るへるJLPT N3approx.Common
    godan verb, intransitive verbFor amounts or numbers going down on their own: the subject itself decreases, with no agent mentioned. Use this when you simply want to say that a quantity or number is diminishing.
    会員かいいんは5人にんに減へった。↗
    The number of members decreased to five.
  • 減らすへらすJLPT N3approx.Common
    godan verb, transitive verbThe transitive counterpart of 減る: someone or something actively decreases an amount or number, cutting it down. Choose this when an agent deliberately diminishes something.
    ジョギングでもして体重たいじゅうを減へらすようにしなさい。↗
    Try to lose weight by jogging.
  • 縮むちぢむJLPT N2approx.Common
    godan verb, intransitive verbSpecifically about size: something shrinks or contracts, becoming physically smaller. Choose it when 'diminish' means a reduction in dimensions rather than in number or amount.
    セーターが洗濯せんたくで縮ちぢんだ。↗
    My sweater shrank in the wash.
  • 褪せるあせるCommon
    ichidan verb, intransitive verbFor gradual fading rather than outright reduction: a memory that diminishes over time until it is no longer clear. Not the word for decreasing quantities or sizes.

Use 「減る」 when an amount or number decreases by itself, 「減らす」 when someone actively reduces it, 「縮む」 for physical size shrinking, and 「褪せる」 for something like a memory gradually fading.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
See also

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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