粗悪|そあくsoaku[0]heiban (flat)

1. na-adjective, no-adjectivecoarse; crude; inferior

• Synonym粗末そまつNeutralCrude, flimsy workmanship; also treating things carelessly. More colloquial than 「粗悪」, and usable as a humble expression.
• Synonym劣悪れつあくNeutralPoor quality or conditions; frequently in 「劣悪な環境」. Broader in application than 「粗悪」.
• Synonym下等かとうNeutralLow in grade or class; can also describe base character. Contemptuous, and not limited to goods.
• Related下等かとうNeutralLow in grade or class; can also describe base character. Contemptuous, and not limited to goods.
• Related拙劣せつれつWrittenWritten/formal prose for clumsy technique; about skill level, not the quality of goods.
• Related劣等れっとうNeutralInferior to others in rank or ability; common in 「劣等感」. Mostly said of people, not goods.
• RelatedチンケCasualColloquial for something shabby, petty and not worth a second look. Contemptuous; said of people as well as things.
• RelatedへぼCasualColloquial and contemptuous: poor at a skill, or inferior farm produce. Mostly about a person's level.
• RelatedチープNeutralLoanword for cheap or cheap-looking; can simply mean inexpensive, without implying poor quality.
• Related安手やすでNeutralCheap goods or a cheap look; stresses the low price, not necessarily shoddy workmanship.
• RelatedつたないWrittenWritten/formal prose for clumsy, unskilled work; also crude workmanship. Often humble, as in 「拙い文章」. 「粗悪」 is strictly about poor quality.
• Related低級ていきゅうNeutralLow-grade or vulgar; also describes taste. Covers a wider range than 「粗悪」.
• RelatedちゃちCasualColloquial for things flimsily made and not sturdy, as in 「ちゃちなおもちゃ」. Disparaging.
• Antonym良質りょうしつNeutralAntonym: good quality, as in 「良質な素材」. The direct opposite of poor-quality 「粗悪」.
• Antonym精巧せいこうNeutralAntonym: finely and carefully made; the opposite of shoddily made 「粗悪」.
• Antonym上等じょうとうNeutralAntonym: superior, high-grade; common in everyday speech. The opposite of inferior 「粗悪」.

Default to 「粗悪」 for shoddy, poorly made goods, as in 「粗悪品」. For bad conditions use 「劣悪」; for flimsy workmanship 「粗末」 or 「ちゃち」. When the point is skill rather than quality, use 「拙劣」 or 「拙い」; for people, 「劣等」 or 「へぼ」; for mere cheapness, 「チープ」 or 「安手」; for low class or taste, 「下等」 or 「低級」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 粗末そまつで質しつが悪わるいこと。