専門外(せんもんがい)

せんもんがい
noun, no-adjective
outside one's specialty; not one's field
educationwork
1. outside one's specialty; not one's field of expertise
Describes a subject, topic, or area of work that falls outside what a person specializes in or is professionally knowledgeable about.
それは専門外(せんもんがい)です。
That's outside my area of expertise.
専門外(せんもんがい)のことはよくわからない。
I don't know much about things outside my field.
専門外(せんもんがい)の質問(しつもん)にも丁寧(ていねい)に答(こた)えてくれた。
They kindly answered questions that were outside their specialty.

Formed from 専門(せんもん) (specialty) + 外(がい) (outside). Commonly used by professionals to politely decline answering questions or to express the limits of their knowledge. Functions as a noun and as a modifier with の.

Common collocations

  • 専門外(せんもんがい)のことはわからない: I don't understand things outside my field
  • 専門外(せんもんがい)の分野(ぶんや): a field outside one's specialty
  • 専門外(せんもんがい)の質問(しつもん): a question outside one's expertise

Similar words

  • 門外漢(もんがいかん): layperson; outsider to a field — more literary, emphasizes being an amateur
  • 畑違(はたけちが)い: wrong field; not one's area — more colloquial, implies a mismatch
  • 素人(しろうと): amateur; layperson — broader term for someone without expertise

Related Words

Compare: 門外漢(もんがいかん) (layperson)
Compare: 素人(しろうと) (amateur)
Compare: 非専門(ひせんもん) (non-specialist)
general
Added 2026.4.29 1:13 · Revised 2026.9.2 13:02
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