How to say "scum" in Japanese

• 上皮うわかわCommon
  no-adjectiveSeldom the word you want for 'scum': it really means the outer layer of skin — the cuticle or epidermis — or bark, and it is not used for calling a person scum.
• くずJLPT N2approx.Common
  nounCovers 'scum' as an insult: a person regarded as worthless or despicable, close to 'piece of trash' and 'loser'. Use it when condemning someone; it is usually written in kana alone.

For 'scum' as an insult — a worthless, despicable person — use 「くず」; 上皮 really means the outer layer of skin or bark and is seldom the word you want for 'scum'.

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

• 上皮うわかわouter layer (e.g. of skin)
• 上っ皮うわっかわouter layer (e.g. of skin)
• くずscum
• あくscum (on a soup, broth etc.)
• 蛆虫うじむしworm
• かすdregs (e.g. of society)