榆木 yúmù elm wood Origin Definitions Defs Strokes Stroke Words Sentences Sents 榆木疙瘩 yúmùgēda elm stump the hard stump or root of an elm tree榆木脑壳 yúmùnǎoké blockhead (colloquial) a blockhead; a thickhead; a person who is stubborn or slow-witted榆木脑袋 yúmùnǎodai blockhead (colloquial) A thickheaded person; a stubborn or brainless individual; literally "elm-wood head".