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Open the tool →信不由衷 (xìn bù yóu zhōng) is a Chinese idiom (chengyu) meaning “to be insincere in one's words or actions”.
信不由衷 is pronounced xìn bù yóu zhōng in Mandarin Chinese.
Literally, 信不由衷 means “sincerity not from the heart”. It is used to mean “to be insincere in one's words or actions”.
信:诚实;衷:内心。诚实不是出于内心。比喻假意敷衍