How to say "phenomenal" in Japanese

• 異数いすう
  no-adjectiveCovers 'phenomenal' in the sense 'exceptional, unusual' — a person or thing that stands apart as an exception to the norm. A less common word, seldom the one you want for everyday praise meaning 'amazing'.
• 桁外れけたはずれ
  na-adjective, nounCovers 'phenomenal' as 'incredible, extraordinary': the image is a number too big for the usual digits, so it stresses degree or scale beyond the ordinary. Also less common — seldom the word for casual praise.

Both words translate 'phenomenal' only in its 'extraordinary, exceptional' sense, not the philosophical 'relating to appearances' one; choose 異数 for an unusual exception, 「桁外れ」 for degree or scale beyond the ordinary, remembering both are less common.

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

• 異数いすうunusual
• 桁外れけたはずれincredible