逆耳

unpleasant to hear / grates on the ear (of home truths)

ear / handle (archaeology) / and that is all (Classical Chinese)

contrary / opposite / backwards / to go against / to oppose / to betray / to rebel

loyal advice jars on the ears (idiom)

speech that grates on the ear (idiom); bitter truths / home truths (that one does not want to hear)