How to say "all-out" in Japanese

• 全面的ぜんめんてきCommon
  na-adjectiveCovers all-out in its most literal sense of total and complete, leaving nothing out: all-out support, all-out war, all-out efforts. It presents the action as extending across every front or aspect.
  彼かれらは全面的ぜんめんてきに私を支持しじしてくれた。↗

  They backed me up in everything.
• コアCommon
  na-adjectiveA loanword whose real meanings are core and hardcore; its all-out sense is the colloquial one of wholehearted, passionate commitment, so it is seldom the word you want for all-out war or all-out effort.
• 本格的ほんかくてきCommon
  na-adjectiveCovers all-out in the sense of full-scale or full-blown: an all-out war, offensive, or investigation that has begun in earnest rather than partially. The nuance is that something has reached its proper, serious form.
  本格的ほんかくてきな休暇きゅうかは３年ねんぶりだ。↗

  It's three years since I had a real vacation.

Use 全面的 for all-out meaning total and covering every aspect, 本格的 for all-out meaning full-scale or getting under way in earnest, and 「コア」 only colloquially for hardcore, wholehearted commitment.

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

• 全面的ぜんめんてきtotal
• コアcore
• 本格的ほんかくてきfull-scale