noun
a gentle or friendly reproof; a warning or reprimand
adjective
admonitory (serving to warn or caution)
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The teacher gave a stern admonition to the students for talking during the exam.
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Mom's admonition to clean my room went in one ear and out the other.
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I got a serious admonition from my boss for being late to work again.
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The dark clouds were an admonition of the storm that was about to hit.