impenetrable
英 [ɪm'penɪtrəb(ə)l]
美[ɪm'pɛnɪtrəbl]
	    - adj. 不能通过的;顽固的;费解的;不接纳的
 
英英释意
- 1. not admitting of penetration or passage into or through;
 - "an impenetrable fortress"
 - "impenetrable rain forests"
 
- 2. permitting little if any light to pass through because of denseness of matter;
 - "dense smoke"
 - "heavy fog"
 - "impenetrable gloom"
 
- 3. impossible to understand;
 - "impenetrable jargon"