内心
ないしん · naishin · JLPT N1 · noun
idea
🫀 内 (inside) + 心 (heart) = what lies inside your heart: innermost thoughts
Read 内 as nai (inside) and 心 as shin (heart). The word names the true feelings you keep inside, the real intention behind what you say.
内 — enclosure 冂 + enter 入
内 originally depicted something entering (入) into an enclosed space (冂), giving the core sense of 'inside' or 'within'. The pictographic image of going into a covered area extended naturally to meanings like inner, internal, and inland. It contrasts with 外 ('outside').
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.