居心

to harbor (evil) intentions / to be bent on / a tranquil heart or mind

surname Ju

(archaic) sentence-final particle expressing a doubting attitude

to reside / to be (in a certain position) / to store up / to be at a standstill / residence / house / restaurant / classifier for bedrooms

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

harboring unfathomable motives (idiom)

to harbor evil intentions (idiom)

What's (he) up to? / What's the motive behind all this?

to have sinister motives