Genuine sincerity and true feelings; heartfelt and earnest.
心意真实诚恳,没有虚假。
元·无名氏《百花亭》第三折常言道海深须见底,各办着个真心实意。”
She helped me with真心实意, never expecting anything in return.
Learn the next connected idiom: 真心实意 (zhēn xīn shí yì) → 意想不到 (yì xiǎng bú dào)
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