固める・堅める|かためるkatameru[0]heiban (flat)

JLPT N1approx.Common
Which spelling to use
固める固める is the more common spelling of this verb and the form beginners should use.
堅める堅める is a less common written variant of 固める, using an irregular kanji; learners should generally choose 固める instead.
Definitions
  1. ichidan verb, transitive verbto harden; to freeze; to strengthen; to solidify; to make (a fist); to tramp down (snow, dirt)
  2. ichidan verb, transitive verbto put together; to collect; to gather; to consolidate
  3. ichidan verb, transitive verbto make secure; to stabilize; to settle down; to strengthen (belief, resolution, etc.); to establish (evidence)
  4. ichidan verb, transitive verbto fortify; to reinforce; to support
  5. ichidan verb, transitive verbto wear for a specific purpose (armor, coat, etc.)in the form に身をかためる
  6. ichidan verb, transitive verbto swear; to resolutely vow; to sincerely promise
  7. ichidan verb, transitive verbto tie tightly; to fasten
  8. ichidan verb, transitive verbto hold a bow fully drawn
Conjugation
Dictionary form固める(かためる)
Polite (masu)固めます(かためます)
Negative (nai)固めない(かためない)
polite (masen)固めません(かためません)
classical zu / nu固めず・固めぬ(かためず・かためぬ)
Past (ta)固めた(かためた)
polite (mashita)固めました(かためました)
Past negative (nakatta)固めなかった(かためなかった)
polite (masen deshita)固めませんでした(かためませんでした)
Te form固めて(かためて)
Potential固められる(かためられる)
Passive固められる(かためられる)
Causative固めさせる(かためさせる)
Causative passive固めさせられる(かためさせられる)
Conditional (ba)固めれば(かためれば)
tara固めたら(かためたら)
Volitional固めよう(かためよう)
polite (mashou)固めましょう(かためましょう)
Imperative固めろ(かためろ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Transitive / intransitive pair
transitive固めるかためる⇄intransitive固まるかたまる
ゼリーを固かためる
固まる describes something solidifying or setting on its own, while 固める describes an agent causing it to solidify.

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

Synonyms & antonyms
  • Synonym硬化させるWrittenWritten, explanatory term for making something hard, mainly in chemistry and medicine (「樹脂を硬化させる」); also used of an attitude hardening (「態度を硬化させる」).
  • Synonym固化させるWrittenWritten, explanatory term for making something solid, used mainly in chemistry and industry; unlike 「固める」, it does not cover strengthening one's resolve.
  • Antonym緩めるゆるめるNeutralNeutral antonym: to loosen, relax or ease something (attention, rules, restrictions), the opposite of making it firm with 「固める」.
  • Antonym崩すくずすNeutralNeutral antonym: to break up, demolish or throw into disorder something whole or solid, undoing the firmness 「固める」 creates.

Use 「固める」 to make something hard or firm, or to strengthen resolve or defenses (「決意を固める」「守りを固める」). For hardening in chemistry or medicine, 「硬化させる」; for solidifying in chemistry or industry, 「固化させる」. Opposites: 「緩める」, 「崩す」.

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

Japanese definitions
  1. 固かたくする、固化こかさせる。強固きょうこにする。
  2. ばらばらであったものをまとめて一ひとつにする。集中しゅうちゅうさせる。
  3. 不ふ確実かくじつであったものを、確実かくじつとする。
  4. 同種どうしゅのものだけで作り上つくりあげる。
Kanji in this word
English 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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