penetrable vs impenetrable

penetrable and impenetrable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
penetrable	No	Yes	No	No
impenetrable	No	Yes	No	No

penetrable (adjective)	impenetrable (adjective)
admitting of penetration or passage into or through	not admitting of penetration or passage into or through
capable of being penetrated	impossible to understand
	permitting little if any light to pass through because of denseness of matter