言而無信

yán'érwúxìn

fail to keep faith; go back on one's word

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yan2 er2 wu2 xin4

to go back on one's word, to break one's promise, to be unfaithful, to be untrustworthy

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言而無信|言而无信 [yán ér wú xìn] ► to go back on one's word ► to break one's promise ► to be unfaithful ► to be untrustworthy