Related words 辛辣 emphasizes a sarcastic, biting tone, while 痛烈 emphasizes the raw force and severity of an attack or criticism.
辛辣 is a na-adjective meaning scathing or cutting, usually describing criticism or remarks, whereas 口が悪い describes the speaker's general manner of talking.
辛辣 is an adjective meaning scathing or harsh (of words, criticism, or writing), while 毒舌 is a noun naming the trait or speech act of being sharp-tongued.
Written forms 辛しん 辣らつ Usage 90%
辛しん らつ Usage 8%
Mixed kanji-kana spelling; less common but still encountered.
しんらつ Usage 2%
Etymology From Chinese 辛辣 (xīnlà), literally 'acrid' or 'pungent', combining 辛 (spicy, bitter) and 辣 (hot, pungent). The Japanese reading しんらつ is the on'yomi.
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