丹精・丹誠|たんせいtansei[1]atamadaka (head-high)

1. noun, suru verb, intransitive verbworking earnestly; sincerity; diligence; effort; pains
   丹精たんせいをこめてつくったこの美うつくしい織物おりものをごらんください。↗

   Take a look at this beautiful embroidery made with great effort.

• Synonym誠実せいじつNeutralHonesty and sincerity as a personal quality; describes a trustworthy character. 「丹精」 instead stresses the painstaking care poured into a thing.
• Synonym真心まごころNeutralTrue, unfeigned feeling, as in 「真心を込める」; centers on the heart you put in, without stressing hard labor the way 「丹精」 does.
• Synonym至誠しせいWrittenWritten style. Utmost sincerity, as in 「至誠天に通ず」; stresses being utterly sincere rather than diligent care.
• Synonym丹心たんしんWrittenWritten style. Shares the 「丹」 of 「丹精」 but means a loyal, devoted heart — loyalty rather than painstaking effort.
• Synonym赤心せきしんWrittenWritten style. Wholehearted loyalty, as in 「赤心を推す」; stresses devotion and loyalty rather than careful labor.
• Synonym赤誠せきせいWrittenWritten style and rare. Utter sincerity with no pretense; stresses an unfeigned heart rather than effort.
• Synonym至心ししんWrittenWritten style, very rare, and often a Buddhist term. Utmost sincerity; not used for painstaking care of things.
• Related誠まことNeutralSincerity and truth, also an adverb as 「誠に」; centers on a true, honest heart rather than effort poured into work.
• Related真面目まじめNeutralSerious, earnest attitude toward what one does; does not stress the loving, painstaking care that 「丹精」 implies.
• Related信しんNeutralTrust, faith, and keeping one's word; mostly appears inside compounds like 「信頼」 rather than standing alone.
• Related実じつNeutralThe same word as 「誠」 above; in its noun sense it means sincerity, as in 「誠を尽くす」 — devotion of heart, not painstaking care.
• Related正直しょうじきNeutralHonesty and frankness; centers on telling no lies, and does not stress painstaking, devoted effort.
• Related本気ほんきNeutralBeing serious and in earnest, as in 「本気を出す」; stresses resolve and real commitment rather than loving care.
• Related誠意せいいNeutralGood faith shown toward people, as in 「誠意を示す」; an attitude in dealing with others, not care lavished on a thing.
• Related忠誠ちゅうせいNeutralLoyalty, chiefly to a lord or one's country, as in 「忠誠を誓う」; faithfulness, not painstaking care.
• Related誠心せいしんNeutralSincere heart, mostly in the set phrase 「誠心誠意」; stresses genuine sincerity rather than diligent effort.
• Related実直じっちょくNeutralHonest, steady, and dependable character, as in 「実直な人柄」; a personality trait, while 「丹精」 is care poured into work.
• Related実意じついWrittenWritten style and rare. One's true intentions or sincere heart; not about painstaking care.
• Related信実しんじつWrittenWritten style, rare, and old-fashioned. Honesty and trustworthiness; not used for devoted labor.
• Related真情しんじょうNeutralGenuine, unfeigned feelings, as in 「真情を吐露する」; about true emotion, not effort or care.
• Related真率しんそつNeutralFrankness and sincerity; rare, and describes a candid, straightforward personality.
• Related衷情ちゅうじょうWrittenWritten style. One's innermost true feelings, as in 「衷情を訴える」; not about painstaking effort.
• Related篤実とくじつWrittenWritten style. Warm, sincere, and kind-hearted character, as in 「温厚篤実」; a personal virtue, not care for a task.
• Antonym怠惰たいだWrittenWritten style. Laziness and idleness — the opposite of the devoted effort of 「丹精」.
• Antonym粗雑そざつNeutralCoarse and careless — the opposite of the meticulous care of 「丹精」.

Use 「丹精」 for the heart and painstaking care you pour into something, usually as 「丹精込めて」, as in 「丹精込めて育てた野菜」; it can also carry a sense of sincere devotion. For good faith shown to people, say 「誠意」; for a true, unfeigned heart, 「真心」. Laziness is 「怠惰」 and rough, careless work 「粗雑」. Many of the others here are written-style or rare terms for sincerity and loyalty.

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

1. 真心まごころ。誠意せいい。
2. 物事ものごとを心こころを籠こめてすること。
3. 物事ものごとを心こころを籠こめてする。