How to say "consistent" in Japanese

• 首尾一貫したしゅびいっかんした
  prenominal modifierCovers 'consistent' as a description of something that stays the same from beginning to end; it is the adjectival form of the idiom, and a less common choice, so not always the word you want.
• 首尾一貫しゅびいっかん
  noun, suru verbThe four-character idiom itself, meaning consistent — unchanging from beginning to end; it names the quality as a set phrase, while its adjectival form describes something. Also less common.
  君きみの行動こうどうが首尾しゅび一貫いっかんしていない。↗

  You are not consistent in your actions.

Both words express one sense of 'consistent' — unchanging from beginning to end — and both are less common; use 「首尾一貫した」 to describe something as consistent, and 首尾一貫 for the four-character idiom naming that quality.

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

• 首尾一貫したしゅびいっかんしたconsistent
• 首尾一貫しゅびいっかんconsistent