卑劣な mean; dirty; base

    • 何て卑劣なやり方だ
    • What a mean [dirty/《口》 low-down] trick!
    • 僕を中傷するなんて君は卑劣だ
    • It's really dirty (of you) to slander me.
    • それは卑劣な行為だ
    • That is a despicable [cheap] thing to do.