刻骨镂心 kègǔlòuxīn unforgettable Origin Definitions Defs Strokes Stroke Words Sentences Sents 刻骨 kègǔ deeply engraved deeply felt and unforgettable; ingrained or deep-rooted like something carved into the bones镂 鏤 lòu to engrave (bound form) to engrave or carve; to chisel designs心 xīn noun mind thought; intellect; the organ of thinking