Definition
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ynfyd
Mae 'ynfyd' yn golygu person sy'n gwneud penderfyniadau annheg neu'n ymddwyn yn dwp.
The word 'ynfyd' means a person who makes foolish decisions or behaves stupidly.
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Mae'n ynfyd i gredu pob gair sy'n cael ei ddweud wrthyt.
It is foolish to believe every word that is said to you.
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Pan gafodd y cyfan ei ddweud, sylweddolodd ei fod wedi bod yn ynfyd am y cyfnod hir.
When everything was said, he realized he had been foolish for a long time.
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Nid yw'n ynfyd yn unig, ond hefyd yn beryglus i'w hunan.
He is not only foolish but also dangerous to himself.