黑心

ruthless and lacking in conscience / vicious mind full of hatred and jealousy / black core (flaw in pottery)

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

abbr. for Heilongjiang province 黑龍江|黑龙江[Hei1 long2 jiang1]

black / dark / sinister / secret / shady / illegal / to hide (sth) away / to vilify / (loanword) to hack (computing)

contaminated food product unscrupulously marketed as wholesome