How to say "immensely" in Japanese

• 一方ならずひとかたならず
  expression, adverbCovers the 'greatly, exceedingly' sense of 'immensely'. A formal, literary adverb for saying something is unusually great in degree; seldom the word you want in ordinary conversation.
• バリ
  adverbAn intensifying slang word covering 'very, extremely, awfully'. At home in relaxed talk among friends, but out of place in polite or written Japanese; not a word for formal 'immensely'.
• すごく
  adverbThe general-purpose intensifier: 'extremely, terribly, awfully'. Use it where English would say 'really' or 'so' — when something strikes you as amazing or overwhelming. Usually written in kana alone.
  「スーはあなたのことすごく怒おこっているわよ」そのウェイトレスは言いうのであった。↗

  "Sue's very angry with you," my new waitress said.
• すっごく
  adverbA colloquial, emphatic variant of すごく: the same 'extremely, very' sense with extra punch, at home in relaxed conversation rather than careful speech or writing.

For the plain intensifying sense of 'immensely' reach for 「すごく」, or 「すっごく」 in casual, emphatic talk; 「バリ」 is slang, while 「一方ならず」 is the formal, literary 'exceedingly' for elevated contexts.

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

• 一方ならずひとかたならずunusually
• ばりvery
• すごくextremely
• すっごくextremely
• すごいawfully