expression, i-adjective
dense; dim; dull-witted; unsympathetic; slow to understand
Describes a person who is slow to grasp things, either intellectually or emotionally. Can imply a lack of empathy or stubbornness in not understanding others' feelings.
彼は物分かりが悪くて、何度説明しても理解してくれない。
He is slow on the uptake and doesn't understand no matter how many times I explain.
あの上司は物分かりが悪くて、部下の苦労を全然わかってくれない。
That boss is unsympathetic and doesn't understand his subordinates' hardships at all.