expression, noun-modifying (irregular)
painfully true; hitting home; making one's ears burn
Describes a remark, criticism, or truth that is so accurate it stings. Often used when someone points out a fault one is aware of but doesn't want to hear. Compare with 耳が痛い, which is the predicative form.
See also: 耳が痛い
I couldn't help but look down at his painfully true remark.
It's a hard truth to hear, but you'd better listen.
From 耳 (ear) + の (possessive particle) + 痛い (painful). Literally 'painful to the ear', it figuratively describes words that sting because they are true.