His promises are just empty words.
empty words
idiomAny type of talk with little meaning; a message that seems to contain meaningful content but is actually vapid.
The politician gave a long speech, but the voters felt it was full of empty words.
Despite the grand rhetoric used during the negotiations, the final agreement proved to be nothing more than empty words designed to pacify the public.
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empty suit
An ineffective or incompetent person in a place of authority.
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empty the clip
To compete with great vigor, especially by making numerous scoring attempts.
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empty the tank
To make the utmost effort; to contribute to the absolute limit of one's energy and abilities.
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have words
To argue, to have an argument.
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man of few words
A man who doesn't speak much; a habitually terse or taciturn man.
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mark my words
Listen to me; used before or after a statement one wishes to emphasize, especially a prediction.
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mince words
To restrain oneself when speaking by withholding some comments or using euphemisms in order to be polite, tactful, etc.
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mouth the words
To speak insincerely.