adjective
not characteristic of or suitable for a gentleman; lacking in the qualities considered appropriate for a man of good breeding and social position
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His behavior at the dinner party was deemed ungentlemanly by the other guests.
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It's ungentlemanly to not hold the door open for someone behind you.
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Dude, that move on the basketball court was totally ungentlemanly.
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Her ungentlemanly treatment of her employees showed her true character.