英[ˌdaɪəˈmetrɪkl]
美[ˌdaɪəˈmɛtrɪkəl]
He's the diametrical opposite of his brother.
他和他的弟弟截然不同。
《牛津高阶英汉双解词典》
"the diametral plane"
"in diametric contradiction to his claims"
"diametrical (or opposite) points of view"
"opposite meanings"
"extreme and indefensible polar positions"