心|しんshin[1]atamadaka (head-high)

1. nounheart; mind; spirit; vitality; inner strength
2. nounbottom of one's heart; core (of one's character); nature
3. nouncentre; center; core; heartusu. written as 芯
4. nounheart (organ)
5. noun, astronomyChinese "Heart" constellation (one of the 28 mansions)
6. nounfriend

• Synonym魂たましいNeutralFor the soul or spirit, and for something treasured, as in 「職人魂」; 「心（しん）」 stresses the inner depths and core.
• Synonym精神せいしんNeutralSpirit and will in the abstract, as in 「精神力」; 「心（しん）」 stresses the inner depths.
• SynonymハートNeutralLoanword for the heart or a heart shape, also the hearts suit in cards; 「心（しん）」 leans written/formal.
• Synonym心臓しんぞうNeutralThe heart as an organ, also nerve or guts; 「心（しん）」 covers the inner self and the core.
• Synonym内心ないしんNeutralOne's true inner thoughts; close to 「心（しん）」 but leans toward describing the mind.
• Synonym胸襟きょうきんWrittenWritten style for the bosom, an open heart, as in 「胸襟を開く」; 「心（しん）」 stresses the inner depths.
• Synonym心根こころねNeutralOne's true nature or disposition, as in 「優しい心根」; 「心（しん）」 stresses the core.
• Synonym心頭しんとうWrittenWritten style, mostly in 「怒り心頭に発する」; 「心（しん）」 is broader.
• SynonymスピリットNeutralLoanword for spirit or mettle, as in 「スポーツマンスピリット」.
• SynonymマインドNeutralLoanword for mindset or way of thinking, as in 「マインドセット」.
• Synonym気きNeutralMood or disposition, as in 「気が強い」; 「心（しん）」 stresses the inner depths and core.
• Synonym心魂しんこんWrittenWritten style: heart and soul, one's full spirit, as in 「心魂を傾ける」; 「心（しん）」 is broader.
• Synonym心胆しんたんWrittenWritten style for the heart as the seat of courage; 「心（しん）」 stresses the inner depths.
• Synonym胸三寸むねさんずんWrittenSet phrase for what one is mulling over, as in 「胸三寸に納める」.
• Synonym胸懐きょうかいWrittenWritten style for the bosom and one's feelings; 「心（しん）」 stresses the inner depths.
• Synonym心意しんいWrittenWritten style for one's mind or intentions; 「心（しん）」 stresses the core.
• Synonym胸臆きょうおくWrittenWritten style for one's inmost thoughts; 「心（しん）」 stresses the inner depths.
• Related懐ふところNeutralThe bosom or inside of one's clothing, figuratively one's heart or finances; 「心（しん）」 stresses the inner depths.
• Antonym肉体にくたいNeutralAntonym on the mind–body axis: the flesh, the physical body.
• Antonym物質ぶっしつNeutralAntonym on the spirit–matter axis: matter, material things.

「心（しん）」 is for one's inner depths and core essence, and mostly appears in compounds like 「心身」, 「心底」, 「核心」. For the soul pick 「魂」, for spirit and will 「精神」, for inner thoughts 「内心」, for mindset 「マインド」; the antonyms are 「肉体」 and 「物質」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. こころ。
2. （シン）心臓しんぞう。