Japanese

ピーマン (pīman): three colors of bell pepper.

Noun

ピーマン ‎(romaji pīman)

1. bell pepper, sweet pepper
2. someone who is stupid, vapid, daft, not very bright (from the way that a bell pepper is mostly hollow inside, as a metaphor for such a person's head being empty)

Synonyms

• (pepper):
  • ベルペッパー (​beru peppā)
  • 甘唐辛子 (あまとうがらし, ​ama tōgarashi)
  • ピメント (​pimento)
• (person):
  • 間抜け (まぬけ, ​manuke)
  • 馬鹿 (ばか, ​baka)
  • 阿呆 (あほう, ​ahō)

References

1. ↑ 1988, 国語大辞典（新装版） (Kokugo Dai Jiten, Revised Edition) (in Japanese), Tōkyō: Shogakukan
2. 1 2 2006, 大辞林 (Daijirin), Third Edition (in Japanese), Tōkyō: Sanseidō, ISBN 4-385-13905-9