不 用 意(ふようい)

ふようい

na-adjective

careless; unguarded; thoughtless

formalcolloquialdescriptive

1. careless; thoughtless; unguarded

Lacking proper preparation, caution, or thought. Often refers to words or actions done without considering the consequences.

不用意(ふようい)な発言(はつげん)で相手(あいて)を傷(きず)つけてしまった。

I hurt the other person with a careless remark.

不用意(ふようい)に個人情報(こじんじょうほう)を漏(も)らさないでください。

Please don't carelessly reveal personal information.

不用意(ふようい)にドアを開(あ)けたら、猫(ねこ)が逃(に)げた。

When I carelessly opened the door, the cat escaped.

Forms

不用意(ふようい)な + noun (careless ~)
不用意(ふようい)に + verb (carelessly ~)

不(ふ) (un-, non-) + 用意(ようい) (preparation)
Literally: "without preparation"

Common collocations

不用意(ふようい)な発言(はつげん) - careless remark
不用意(ふようい)な行動(こうどう) - thoughtless action
不用意(ふようい)に口(くち)を滑(すべ)らせる - to let something slip carelessly

Similar words

軽率(けいそつ) - rash, thoughtless (more about being imprudent)
無防備(むぼうび) - defenseless, unguarded (more about vulnerability)
うかつ - careless (more colloquial)

Register

Neutral to formal. Common in news, official statements, and formal writing.

Related Words

Synonym: 軽率(けいそつ) (rash, thoughtless)

Compare: 無防備(むぼうび) (defenseless, unguarded)

Compare: むやみ (reckless)

general

Added 2026.1.19 16:21 · Revised 2026.9.4 21:29

07000/07391_fuyoui