野心
やしん · yashin · JLPT N1 · noun
ambition
野 — 里 (village) + 予 (phonetic)
Originally written 埜 (forest 林 over earth 土), depicting wild land beyond cultivated fields. The modern form 野 combines 里 (village/settled land) with 予 as a phonetic component, keeping the meaning of open country, wilderness, or untamed.
心 — pictograph of a heart with chambers and aorta
心 is a pictograph showing a stylized heart, with strokes representing the organ's chambers and the aorta at the top. Originally meaning the physical heart, it broadened to cover mind, feelings, and intentions, since ancient Chinese thought located thinking and emotion in the heart.