adjective🔗Share空洞,不实在。 Insubstantial."The politician's promises to lower taxes seemed unsubstantial, lacking any real detail or plan. "这位政客降低税收的承诺听起来很空洞,没有任何具体的细节或计划,让人觉得不实在。qualityappearancebeingChat with AIVocabulary GamePractice Reading