Inferior or low-grade; of poor quality or coarse/vulgar in character. Often used in critical or negative contexts.
あの商品の品質は低劣で、すぐに壊れてしまった。
That product was of poor quality and broke immediately.
彼の批判は事実に基づかない低劣な中傷だった。
His criticism was a low and baseless smear.
低劣な行為は社会的にも許されない。
Vulgar or base conduct is not acceptable socially.