無防備(むぼうび)

むぼうび
na-adjective
defenseless; unguarded; unprepared
1. defenseless; unguarded; unprotected
Lacking defense or protection against attack, danger, or harm.
無防備(むぼうび)な状態(じょうたい)だ。
It's a defenseless state.
無防備(むぼうび)な都市(とし)を攻撃(こうげき)するのは国際法(こくさいほう)違反(いはん)だ。
Attacking an undefended city violates international law.
サイバー攻撃(こうげき)に対(たい)して無防備(むぼうび)な企業(きぎょう)が多(おお)い。
Many companies are unprotected against cyberattacks.
2. unguarded; careless; open
Showing no caution or wariness, often in a personal or emotional sense. Can describe someone who is innocently open or naive.
彼女(かのじょ)の無防備(むぼうび)な笑顔(えがお)。
Her unguarded smile.
寝顔(ねがお)は無防備(むぼうび)で可愛(かわい)い。
Their sleeping face is unguarded and cute.
彼(かれ)は人(ひと)を疑(うたが)わない無防備(むぼうび)な性格(せいかく)で、よくだまされる。
He has an unguarded personality that doesn't suspect others, so he often gets deceived.

Composed of 無(む) (without) + 防備(ぼうび) (defense, guard). Can describe physical defenselessness (a city without military protection) or personal openness (an unguarded expression). The figurative sense is common in everyday conversation and manga/anime descriptions.

Common collocations

  • 無防備(むぼうび)な姿(すがた): an unguarded appearance
  • 無防備(むぼうび)な都市(とし): an undefended city (legal/military term)
  • 無防備(むぼうび)にさらす: to leave exposed without protection

Similar words

Related Words

Compare: 油断(ゆだん) (carelessness)
Compare: 丸腰(まるごし) (unarmed)
Compare: 無力(むりょく) (powerless)
Compare: 不用意(ふようい) (careless)
general
Added 2026.4.1 6:34 · Revised 2026.9.2 13:02
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