抜きで

いつも真面目な話ばかりだから、たまには冗談「抜きで」で真剣に語り合おうよ！・・・あれ？逆か！

The pattern '〜抜きで' (nuki de) means 'without...', 'leaving out...', or 'skipping...'. It indicates performing an action by intentionally removing or excluding a component that is normally expected (e.g., jokes, flattery, wasabi). It connects directly to nouns. It is highly expressive for stripping away superficial elements to get straight to the core of a matter. In this sentence, it translates perfectly as: "We always have serious conversations, so for once let's have a serious talk without any jokes! ...Wait, isn't that backwards?". The correct option '抜きで' dynamically matches the structural requirements and logical flow of the statement. 'かわりに' is incorrect because 💡 '冗談の代わりに真剣に語る' (instead of jokes, we talk seriously). grammatically fine, but '〜抜きで' (scandalously leaving it out) is a much punchier spoken expression when declaring a rule for a conversation ('no jokes allowed!').

「〜抜きで」は、「本来あるべきもの、または当然含まれるべきもの（冗談、お世辞、わさびなど）を入れないで、排除して何かを行う」という状態を表す文法表現です。 接続は「名詞＋抜きで」または「名詞＋抜きにしては」となります。儀礼的な要素を省いて、より本質的・現実的な対話や取引を行う際によく使われます。 本問では、「いつも真面目な話ばかりだから、たまには冗談（　　　）で真剣に語り合おうよ！・・・あれ？逆か！」という文脈で使われており、「抜きで」を補うことで最も自然な日本語表現になります。 他の選択肢について、かわりには「💡 '冗談の代わりに真剣に語る' (Instead of jokes, we talk seriously). Grammatically fine, but '〜抜きで' (Scandalously leaving it out) is a much punchier spoken expression when declaring a rule for a conversation ('No jokes allowed!').」ため、この文脈では不適当となります。