Translation guide
The English word "active" covers several distinct meanings. This guide breaks them down into practical Japanese equivalents for learners.
Describing a person who moves a lot, exercises, or is full of energy.
Most common word for an active, lively person, especially children or groups. Can also describe discussions or activity levels.
彼女はとても活発な子供だ。
She is a very active child.
Emphasizes being engaged in activities, often used for lifestyle or personality.
彼は活動的な生活を送っている。
He leads an active lifestyle.
Literally "moves a lot"; a casual way to say someone is physically active.
うちの犬はよく動く。
Our dog is very active.
Taking part in an organization, event, or activity.
Means "to actively participate". Use this pattern to describe being actively involved.
彼は地域活動に積極的に参加している。
He is actively involved in community activities.
Adjective meaning proactive or active in attitude. Often used for participation or attitude.
彼女はクラスで積極的だ。
She is active in class.
Means "is active" in the sense of being currently engaged in an activity or organization.
彼はボランティアとして活動している。
He is active as a volunteer.
Something that is working, turned on, or in effect.
Means "valid" or "active" for accounts, licenses, subscriptions, etc.
このパスワードはまだ有効ですか？
Is this password still active?
Used for machines, systems, or devices that are currently operating.
エアコンが作動中だ。
The air conditioner is active.
Specifically for people still working in their profession (e.g., active duty, active player).
The grammatical term for sentences where the subject performs the action.
The technical term for active voice in grammar.
この文は能動態です。
This sentence is in the active voice.
Describing a volcano that is not dormant or extinct.
Standard term for an active volcano.
富士山は活火山です。
Mt. Fuji is an active volcano.
The loanword アクティブ is common in Japanese but mainly for "physically active" or "active lifestyle" contexts. It is not used for accounts, volcanoes, or grammar. Overusing it can sound unnatural.
彼は現役の消防士だ。
He is an active firefighter.