How to say "bisexual" in Japanese

• バイ
  nounA shortened form of バイセクシャル, covering the sexual-orientation sense of 'bisexual'. Being an abbreviation and itself less common, it is a marginal choice; the fuller loanword is usually clearer.
• バイセクシャル
  no-adjective, na-adjectiveThe full loanword for the sexual-orientation sense, usable of a person or of attraction to both sexes. This is the most direct rendering when discussing someone's sexuality.
• 両性愛者りょうせいあいしゃ
  nounThe kanji term, literally 'a person who loves both sexes'. It matches 'bisexual' only as a noun for a person, not as a general or adjectival description.
• バイセク
  no-adjectiveA colloquial abbreviation for the sexual-orientation sense. It fits relaxed conversation, but being both colloquial and less common, it is seldom the best choice for formal writing.
• 半陰陽はんいんよう
  no-adjectiveReally a word for hermaphrodite, intersex or androgynous characteristics — having both male and female physical traits — rather than for sexual orientation; it is seldom the word you want for 'bisexual'.

All five are less common renderings: for the sexual-orientation sense use 「バイセクシャル」 or its abbreviations 「バイ」 and 「バイセク」, or 両性愛者 for a person specifically, while 半陰陽 covers physical characteristics rather than orientation.

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

• バイbisexual
• バイセクシャルbisexual
• 両性愛者りょうせいあいしゃbisexual (person)
• バイセクbisexual
• 半陰陽はんいんようhermaphrodite
• 両刀りょうとうbisexual (person)
• 両刀使いりょうとうづかいbisexual (person)