How to say "complexity" in Japanese

• 複雑さふくざつさCommon
  nounThe default word for complexity in the sense of intricacy or complicatedness, of systems, problems, situations, or structures. It is what you want for 'the complexity of the problem'.
• 濃淡のうたんCommon
  nounLiterally 'shades and tones'; for 'complexity' it applies only to flavor, meaning depth and subtle variation of taste. Seldom the word for complexity elsewhere; really a wine- and food-tasting term.

Use 「複雑さ」 for the general sense of something being complicated or intricate; use 濃淡 only for complexity of flavor, where it suggests depth and subtlety rather than intricacy.

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

• 複雑さふくざつさcomplexity
• 複雑性ふくざつせいcomplexity
• 繁はんcomplexity
• 濃淡のうたんdepth (of flavor)