← Ave Mujica
Episode 3 N5

健康けんこうkenkou niよくないyokunai

BanG Dream! Ave Mujica 第3話 Mortis 比出手勢說「健康によくない!」的場景

Phrase Breakdown

健康けんこうkenkou niよくないyokunai!」

It's bad for your health!

健康けんこう
Noun
「健康」= health, read けんこう (mind the long こう). Also works as a na-adjective: 健康な生活 (a healthy lifestyle). The preceding line says Mutsumi suffers from always obeying Sakiko — hence, "bad for her health".
Particle 🔑
noun + に + いい/よくない = "good/bad for ~".「に」marks the target of the effect. Handy pattern: 体にいい (good for the body), 目に悪い (bad for the eyes).
よくない
i-adjective negative 🔑
The negative of「いい」(good) is not「いくない」! いい conjugates through its other form「よい」: negative = よくない, past = よかった. One of the classic N5 traps. Mortis delivers this childlike verdict with a hand gesture — maximum contrast.
🎭
Mutsumi also appears in MyGO!!!!!
「バンド楽しいって思ったこと一度もない」

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