thick的对应词是: thin.
He has thin hair.
他头发稀疏。
She looks thinner than before.
她看上去比过去瘦了。
Her speech sounded rather thin.
她的演讲听上去颇为空洞。
Care thinned her cheeks.
忧虑使她面颊瘦削。
水利万物而不争,
而万物莫能与之争。