～っぱなし

• Reading: っぱなし
• Romaji: ppanashi
• Formation: Verb masu-stem + っぱなし

Meaning

An auxiliary suffix meaning 'left ~ing' or 'keep on ~ing,' expressing that an action has been started and left in that state, or that something continues without stopping, usually with a negative nuance.

っぱなし attaches to the verb masu-stem and conveys two related meanings: first, that something has been left in a state resulting from an action (e.g., 開けっぱなし — left open), and second, that an action continues without interruption (e.g., 立ちっぱなし — standing the whole time). Both usages carry a nuance of negligence, inconvenience, or excess. The form derives from 放す (hanasu, to release/let go), implying something has been 'let go' without proper attention. It conjugates as a noun (っぱなしだ, っぱなしの + noun). This pattern is very common in daily life for describing situations where someone forgot to turn something off, close something, or take care of something properly.

Examples

1. エアコンをつけっぱなしにして寝てしまった。 I fell asleep with the air conditioner left on.
2. 電車で二時間立ちっぱなしだった。 I was standing for two hours straight on the train.
3. ドアを開けっぱなしにしないでください。 Please don't leave the door open.

Usage Guide

Context: spoken, everyday

Tone: critical

Do Say

• テレビをつけっぱなしで出かけてしまった。
• 水を出しっぱなしにすると水道代が高くなるよ。
• 今日は座りっぱなしで腰が痛い。
• 窓を開けっぱなしにしたら虫が入ってきた。

Don't Say

• エアコンをつけるっぱなしにした。(Using dictionary form instead of masu-stem — the correct form is つけっぱなし, from the masu-stem つけ) → エアコンをつけっぱなしにした。
• 勉強しっぱなしで成績が上がった。(Using っぱなし for a positive continuous action — っぱなし implies negligence or excess; for positive persistence, use 続ける) → 勉強し続けて成績が上がった。

Origin & History

っぱなし is derived from 放し (hanashi), the masu-stem of 放す (to release/let go). The small っ is a gemination that developed in casual speech, emphasizing the careless or uncontrolled nature of the action.

Cultural Context

Generation: All ages

Social background: Universal