良性(りょうせい)

りょうせい
noun, no-adjective
benign; non-malignant
formalhealthscience
1. benign; non-malignant
Not harmful or dangerous. Primarily used in medical contexts to describe tumors, growths, or conditions that are not cancerous or life-threatening.
良性(りょうせい)の腫瘍(しゅよう)だった。
It was a benign tumor.
検査(けんさ)の結果(けっか)、良性(りょうせい)と判明(はんめい)した。
The test results revealed it to be benign.
良性(りょうせい)のポリープでも定期的(ていきてき)に経過(けいか)観察(かんさつ)が必要(ひつよう)です。
Even benign polyps require regular follow-up observation.

Composed of 良(りょう) (good) and 性(せい) (nature/character). Almost exclusively used in medical contexts. When hearing test results, 良性(りょうせい)です is reassuring news.

Common collocations

Similar words

  • 悪性(あくせい): malignant — the opposite; cancerous or dangerous
  • 陽性(ようせい): positive (test result) — a different medical term; positive does not mean malignant
  • 陰性(いんせい): negative (test result) — negative test result

Note on homophones

Do not confuse with 両性(りょうせい) (both sexes / bisexuality), which has the same reading.

Related Words

Compare: 陰性(いんせい) (negative)
general
Added 2026.4.6 6:08 · Revised 2026.9.2 13:02
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