Malicious; describing behavior or quality that is intended to harm or is underhanded.
悪質なネット詐欺が増えているので注意が必要だ。
Malicious online scams are increasing, so caution is necessary.
悪質なデマを流す行為は許されない。
Spreading malicious false rumors is unacceptable.
彼の悪質な妨害でプロジェクトが遅れた。
The project was delayed because of his malicious interference.
Shoddy; of poor quality — used for inferior goods, workmanship, or performance.
あの店で買った靴は悪質で、すぐ壊れた。
The shoes I bought at that shop were shoddy and broke quickly.
悪質な製品を市場に出すことは企業の信頼を損なう。
Putting poor-quality products on the market damages a company's credibility.