adj: not admitting of penetration or passage into or through; "an impenetrable fortress"; "impenetrable rain forests"
adj: permitting little if any light to pass through because of denseness of matter; "dense smoke"; "heavy fog"; "impenetrable gloom"
adj: impossible to understand; "impenetrable jargon"
Length: 12 letters
Scrabble value: 18
Words with Friends value: 20
Literati value: 14
TWL (USA): Found
SOWPODS (UK): Found
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