pǒ
not
thereupon
叵测
pǒ cè
unfathomable
居心叵测
jū xīn pǒ cè
harboring unfathomable motives (idiom)
心怀叵测
xīn huái pǒ cè
see 居心叵測|居心叵测[ju1 xin1 po3 ce4]