How to say "utterly" in Japanese

• 散々さんざんCommon
  na-adjective, adverbCovers 'utterly' in negative experiences: being utterly exhausted, humiliated, or having an utterly miserable time. It suggests a thorough, draining degree of trouble or unpleasantness.
• とうていJLPT N1approx.Common
  adverbOnly means 'utterly' with negation: something is utterly impossible or cannot be utterly done by any means. It never intensifies affirmative statements.
  あなたの話はなしは到底とうてい真実しんじつだと思おもえない。↗

  I can't possibly think your story is true.
• つくづくCommon
  adverb (with と)Really means 'deeply' or 'keenly' — feeling or realizing something completely. It is a marginal match for 'utterly' and is seldom the word you want for that sense.
  彼かれは、自分じぶんの不幸ふこうをつくづく考かんがえた。↗

  He brooded over his misfortunes.

Choose 散々 for being utterly fed up or having a thoroughly bad time, 「とうてい」 only with negatives for 'utterly impossible', and 「つくづく」 for feeling something deeply and keenly rather than for plain 'utterly'.

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

• 散々さんざんthoroughly
• とうてい(cannot) possibly
• つくづくdeeply
• ただただabsolutely
• 杳としてようとしてutterly (unknown; esp. of someone's whereabouts)
• てんで(not) at all
• こてんぱんcompletely (beaten, defeated, etc.)
• ほとほとquite
• からっきしquite
• さんざっぱらthoroughly
• さんざseverely
• さんざんぱらthoroughly
• こてんこてんcompletely (beaten, defeated, etc.)
• ころりeasily
• 端から端まではしからはしまでfrom one end to another
• がらり(changing) completely
• はたとcompletely
• ころっとcompletely (e.g. forgetting)